Programming :: Bash Scripting - Display Real Name From Username Logged In + User Processes?

Jan 14, 2011

i am using putty to connect to the linux server and i am using nano as my text editor to write a bash script.

this is my script:

echo "Please enter your Username"
read userName
userName= grep $USER /etc/passwd | cut -d: -f5
echo "Welcome " $userName | cat >> output.txt

the problem i have is that when i enter my username, the output (my real name) does not display in the output.txt. instead it displays in putty. so when i run my script in putty it shows the message to enter username and after i enter my username my real name appears below it. i want it to show in the output.txt

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Programming :: Get Real Time Information About How Many User Are Logged In And Their Ips

Jan 20, 2009

I use tomcat as my server platform in Ubuntu for a war file. I know in order to get real time information about how many user are logged in, we can count how many active sessions exist by a SessionCounter code. However, I have to permit HttpSessionListener in web.xml of tomcat. From other users' experiences, the configuration is complexed and has some errors.

Here's the link:

[URL]

In order to get users'ip, in jsp, use request.getremotehost() or request.getremoteaddress() by editing the jsp file. I wonder if there's some open source software to use for these two purposes.

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Programming :: Finding The Username Of A User Who Has Logged In (roaming Profile)

Mar 14, 2011

I want to be able to create a php webpage that will show the logged in users files and how full their home directory is (roaming profiles). The php side isn't a problem....the problem is how do i determine the username of the user who is logged into Linux not the webpage itself?

What i want is when the user opens this page, it knows who they are already. I have seen this done on an intranet at work (don't know what OS it is running on tho) where I login to the network, view the page and it says my name.

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Programming :: Bash Shell Scripting / Using The Sort Command To Sort The Top 5 CPU Processes?

Feb 28, 2010

What options should I use when I'm using the sort command to sort the top 5 CPU processes (ps -eo user,pid,ppid,%cpu,%mem,fname | sort ??? | head -5) showing max to min usage?

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Programming :: Bash Scripting Handling User Input Sections Automatically?

Jun 17, 2010

I have a system setup script for my Slackware installations that pulls all packages and source files from another machine and sets everything up to be identical between machines. The script works as expected but make it entirely unattended. How do I make the bash script deal with automatically selecting "Yes" for, for example "Install x(Yes/No): " when prompted by a make file?

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Programming :: Bash Scripting - Taking User Input And Adding It To A Particular Area Of A File?

Jan 12, 2010

in bash scripting...say I want to take the input from a user via a question...I would do this:

Quote:

#!/bin/bash

echo "How large do you want this partition to be in GB (enter only the number)?" read PART_SIZE echo "You want your partition to be $PART_SIZE GB" But I don't want to echo it back to the screen, I want to add it to the content of /etc/fstab. I have been mucking around with sed to find the tmpfs partition in /etc/fstab and add the partition size attribute (this is to use the onboard RAM as a volatile partition)...but am not having any luck...

The portion of /etc/fstab that uses /dev/shm for the tmpfs partition is:

tmpfs /dev/shm tmpfs defaults 0 0

So, if a user says "24" GB to the answer (from above), how do I get it to automatically add that value to the tmpfs partition line in /etc/fstab? So it would look like:

tmpfs /dev/shm tmpfs size=24g,defaults 0 0

I understand that I would also have to come up with a way to put "size=XXg", which I could do with a copied over generic file before this action...then the script would have to find "XX" and replace it with the user's figure...

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Programming :: Bash Scripting With Sudo / Password Prompt And Accepting User Input?

Jul 30, 2011

I'm creating a bash script to do some tasks for me. I would like the script to be run at a set time of everyday. My first question is if it is possible that if one of the commands in the script requires sudo, is there a way to get around it with out making sudo not require a password. Such as, is there a way to include the password in the script? If that is the case, I can always just set the file as read only by sudo. I've been looking for a way to do this, with no success. if I have a command that wants input, how do I give it to the program. For example, if I want to make a zip file that is encrypted, the command would go as:

Code:

zip -r example * -e

now how would I get the script to insert my wanted password.

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Programming :: Reading A Bash Variable In Bash Scripting ?

Nov 26, 2008

I have a config file that contains:

my.config:

Code:

Now in my bash script, I want to get the output /home/user instead of $HOME once read. So far, I have managed to get the $HOME variable but I can't get it to echo the variable. All I get is the output $HOME.

Here is my parse_cmd script:

Code:

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Ubuntu :: Phantom User Still Logged In - Bash: Kill: (5485) - No Such Process

Sep 13, 2010

$ uptime
09:55:00 up 7 days, 6 min, 2 users, load average: 0.00, 0.00, 0.00

..but I'm the only user logged in!

$ who -a
system boot 2010-09-06 09:48
run-level 2 2010-09-06 09:48 last=

[code]....

looks as though this is the culprit, but...

$ kill 5485
-bash: kill: (5485) - No such process

This process doesn't exist in the /proc folder or the output of ps. Does anyone know how this happened, and how to remove this ghost user from my system without a complete reboot? I think I have seen a similar thing on a RedHat machine ages ago but I have never figured out how to log out these ghost users.

$ uname -a

Linux ubuntu 2.6.24-28-server #1 SMP Wed Aug 25 16:07:16 UTC 2010 i686 GNU/Linux

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Programming :: Scripting The Email With Bash?

Jul 8, 2010

I need to find a way to download the attachment from a daily report e-mail to me. The kicker is it will need to be down with a cron tabbed bash script.For example, which linux based CLI client is best suited to be scripted?

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Programming :: Bash Scripting: How To Keep Leading 0 On ' And '

Jan 27, 2010

I'm trying to put together a script that will quickly run through an archive directory of log files that are named by day of the month 01.gz, 02.gz, 03.gz.... 31.gz. The script uses gunzip -c | grep | wc to count up the total number of hourly occurrences of a filename and outputs the results to stdout.

The only snag I have left is the octal limit when it gets to 08 and 09. I've seen examples using perl and awk, but this script uses a number of nested for loops and if statements that I don't want to have to rewrite in a different syntax. I found that I can use num=10#08 to set that variable to a base 10 instead of a base 8, but then I lose the leading 0 again when it passes the number to the next filename variable.

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Debian Programming :: Bash Scripting For Jessie

Aug 25, 2015

You are probably using systemd (check it with ps --pid 1) and therefore /etc/init.d isn't considered for autostart. Here can you find some information about systemd and autostart [1]. As far as I know systemd isn't intended to start applications with systemd. I recommend you to use the autostart feature of your window manager or desktop environment or at least the .xinitrc.

[URL] ....

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Programming :: BASH Scripting - Creating A Map Tree?

May 7, 2011

looking to write a dependency map tree that creates a tree structure of object names . This tree will be written to a file and read back to create the tree structure of files . how to write this using bash ?

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Programming :: Bash Scripting: Menu From File?

May 29, 2011

I have a file called list.txt with on word on each line that changes in length. I'd like to make a menu, each line being its own choice. I pieced together most of it the only thing missing is a failsafe for typing a number out of range

Code:
#!/bin/bash
p=`cat list.txt | awk '{print$1}'`

[code]....

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Programming :: Bash Scripting - Pointed In The Right Direction?

Jul 6, 2011

I've been using Ubuntu for about 6 months now, but haven't had a need to start scripting until just recently. I know programming basics, but that's about it.Anyway, I have a program that I would normally run in this manner (note that I didn't create a permanent alias because I've been moving the program around a lot):alias dx='python /path/to/dxProgram.py' dx A_input.dx B_input.dxSo, you see, program dx takes two input files, and 'A' must come before 'B'. I have a folder full of these types of files that I'd like to loop through with this program. They're named as follows:

0_A_input.dx
0_B_input.dx
1_A_input.dx

[code]....

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Programming :: Subtract Two Non-real (aka Decimal'd) Numbers Via Bash?

Apr 28, 2010

I just need to perform a simple operation of subtracting two numbers - that aren't whole numbers, i.e 200.56 - 67.24attempting to use expr i merely get "expr: non-numeric argument"

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Programming :: Bash Scripting - Logging To The Virtual Account?

May 21, 2011

I need to write a bash script that will allow me to manage my "virtual network" (in reality just a bunch of directories and files). I need to obtain something like : I have my own command 'connect'. We can use it in two different modes: user and admin. If I type 'connect adashiu virtual_machine_name, computer will ask about password, if password is correct he will change a prompt to :

adashiu_at_virtual_machine_name >

after that user can start to use commands reserved only for user mode. Analogically with admin mode: prompt 'admin >' and administrator can only use bunch of commands reserved for him. changing prompt and separated commands for user and admin ?

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Programming :: Bash Scripting Arrays And Indirect Referencing

Feb 23, 2010

I've got a situation. I'm having GNU bash version 3.00.16(1) on Solaris 10. I need to declare an array say arr1 which will be populated by an output of a command.

declare -a arr1
arr1=( $(/some/command) )

Supposing it will eventually (after executing the command) have element values as -

arr1[0]=1234
arr1[1]=5678
arr1[2]=7890

Now, I need to declare another set of arrays, one for each of the element values above - e.g.

declare -a arr1_1234
declare -a arr1_5678
declare -a arr1_7890

And I also need to populate elements of each of above 3 arrays with output of another command in a loop. So, these arrays will hold values something like -

arr1_1234[0]="abc"
arr1_1234[1]="def"
arr1_1234[2]="ghi"

arr1_5678[0]="jkl"
arr1_5678[1]="mno"
arr1_5678[2]="pqr"
arr1_7890[0]="tuv"
arr1_7890[1]="xyz"
arr1_7890[2]="aab"

I'm able to declare and populate arr1[*]. My question is how do I declare, populate and print the subsequent arrays and their elements?I am feeling rather thick to get this working.

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Programming :: Bash Scripting - Output As Multiple Files?

Jan 26, 2011

I have wrote a 1 line command that parses a file, locates the IP Address in the file and then trims the output the way I want it, and then sorts numerically and by uniqueness and then >> appends to output.txt

I can get all the IP's into 1 file "output.txt", but what I am really looking for is some type of way to create a text file, for each IP it finds labeled xxx.xxx.xxx.xxx.txt and also put that ip address into that file..

xxx.xxx.xxx.xxx = the ip address it finds

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Programming :: Bash Scripting With File Date Comparison?

Mar 23, 2011

I need to be able to compare a file date with system date and delete files older than 30 days.

the file name is basically
error_log.03222011

of course the extension is the date the file was created.

Oh and before i get hammered I looked everywhere but am unable to make sense of what I found.

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Programming :: Scripting, Perl Or Bash; Run A Background Process, Get Pid?

Apr 1, 2010

pretty simple. how would you background a process from a script and get its process id at the same time?

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Programming :: BASH Scripting - Creating A Custom Service (CentOS)?

May 7, 2011

I am trying to create a custom service to manage a minecraft server what runs in a screen session (this is to allow easy console access as opposed to running it as a nohup background process). I am hitting two main issues with this script so far and wondering if anybody is able to shed some light on it, considering I am far from the greatest BASH scripter on Earth.

The issues are related to start and stop. the first issue with start is there is a command run "screen -dmS minecraft java -Xms1024M -Xmx1024M -jar /minecraft/minecraft.jar nogui" what doesn't appear to work, however when run from console (copy and pasted) this command seems to run perfectly. I am uncertain as to why this is not working within the script. Also if run from a script in /minecraft it also appears to work but in the minecraftd script I have created at /etc/init.d it does not work. I think the issue might be related to the location but am not certain on it, nor how to resolve it.

the second issue with stop is that it works sometimes but at other times it does not, overall it seems to work about 30~50% of the time. When it works it passes a couple of disconnection messages to the screen session and then gives the stop command (the command to gracefully terminate the minecraft server). It seems to work more often when using screen that I attach to the minecraft session while it is running but really not sure if this is an issue with my scripting or an issue with how I am passing things to screen.

The full code in /etc/init.d/minecraftd is below

Code:

#!/bin/bash
## Script Information
## Script Author: Berwick East

[code]....

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Programming :: BASH Scripting: Hide Plain Text Passwords

Jun 15, 2010

I was wondering if there is way to hide passwords in bash scripts. For example: I have to write a script to export a full ldap structure, and I'm using the ldapsearch -y passwordfile, where password file is a plain text file that contains the password. Is there a way to hide the password from that file?

I was thinking to remove the r attribute from the file and before the script is lunched to put the attribute back, but is not a good solution, the same with immutable attribute.

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Programming :: Bash Scripting...read A Value From A File Then Assign To Variable?

Feb 27, 2011

At my wit's end I can't find anything that I understand well enough to use. This is for a Unix class, we are working with shell scripting. File1 has 5 in it and File2 has 100 in it.The teacher wants us to read the values then do the math. This is what I have so far:#!/bin/bashvar1='cat File1'var2='cat File2'var3=`echo "scale=4; $var1 / $var2" | bc`echo The final result is: $var3

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Aug 11, 2009

Is there a way to process individual characters one-by-one from a text file in Bash, or is that hoping for a little too much from this lovable old clunker?

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May 9, 2011

How to change the complex number like -123.45e67 in to real number.
with command of awk print

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Sep 5, 2010

How do I create a user account in a shell script? I know this may sound n00bish to you, but I know it's more than just mkdir-ing the home directory and subdirectories.

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Programming :: Bash Scripting To Programming?

Jul 13, 2011

i'm in the process of learing C++. currently i'm creating shell scripts to get things done. i'm just curious how, as a programmer using C++ you would get a similar job done.as an example i have a script that takes the contents of files, pipes it to some sed and awk commands, which is piped to create a new file. that file is then imported into a mysql database.if you were going to do this in C++, would you call the sed/awk programs to modify the file, or can it be done within the program itself? i'm probably jumping the gun here because i've just started learing about pointers so this is above my ability

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Programming :: STDIN, STDOUT, STDERROR Redirection For Scripting - Bash: Log.txt: No Such File Or Directory

Sep 7, 2010

I'm writing a script to execute bash commands in the PHP CLI. I would like to suppress errors from bash and write my own error message if an error occurs. So far I have this (assuming log.txt doesn't exist!):

Code:

tac log.txt 2>/dev/null

Which works as expected, tac kicks up an error but the error is suppressed, but when I use this:

Code:

tac < log.txt 2>/dev/null

I get:

Code:

bash: log.txt: No such file or directory

The tac error is suppressed but bash still gives me a dirty error.

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Ubuntu :: Scripting For A Real Stock Ticker?

Oct 6, 2010

I'm a business student and we have a stock ticker in the atrium of our building that was being run off of an old 386 computer that bit the dust. Unfortunately, the individuals who wrote the program that updates the ticker (with selected stocks only, from a student run portfolio) are long gone.

Basically, I'm looking for way to display certain stock quotes updated every few minutes on a real-life ticker (green lettering, scrolling side to side) with selected stocks, including the changes in stock price (arrows as well).

I've looked into programs like SMTM, but I'm not quite finding what I need. I don't have much scripting knowledge but I figured this could be done relatively easily, perhaps with GREP?

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