Programming :: Store Output Of Command With Pipes?

Jan 20, 2011

I need to find one RUNNING word in latest created logs.
and as soon as i will get RUNNING WORD , i have to execute another Unix Command.

I wrote following script code...

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Programming :: Receive Command Output And Store It To A Variable?

Apr 3, 2010

Suppose I want to account number of files beginning with abc , I can use "ls 'abc* | grep abc | wc -l", this will return me a number.
I want to store this number in a variable, say var1, so I tried
1. "ls 'abc* | grep abc | wc -l |read var1", but this didn't work as var1 has no value somehow.
2. var1='ls 'abc* | grep abc | wc -l', this just assign the entire string "ls 'abc* | grep abc | wc -l" to var1, which is not I wanted.

I don't want to store the value to a temporary file and then read the value from that file. I think there should be a direct way to get the value, but don't know how. I know in tcsh, one can just use set var1='ls 'abc* | grep abc | wc -l', but it also doesn't work in bash. Can anyone give any clue about this?

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Programming :: Shellscripting: Pipes And Output Redirection?

Aug 21, 2010

see these simple commands:

Code:
# dbus-monitor --system >> /data/eject.txt
This one works as expected ... dbus-monitor never terminates and whenever it outputs new lines, they are

[code]....

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General :: Any Way To Store Output Of Command Into Variable?

Mar 3, 2010

I tried using the tail command in my shell script and storing that value in a variable a but an error keeps coming. Is there any other way to store the output of a command into a variable. Cannot Read text from text file and store it in a variable using shell script. The thing is I need a number from the file new.txt and use that number in my script

#!/bin/bash
a = `tail -1 new.txt|head -n 1`
echo $a

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General :: Store The Output Of Date And Watch Command To A File

Jun 15, 2011

I am trying to watch a command and try to log it into a file. I tried

watch -t -n 10 "(date '+TIME:%H:%M:%S'
; ps aux | grep "pattern" | wc -l)" >>
logfile

and am expecting a result like

TIME: 10:32:30 12
TIME: 10:32:40 18
TIME: 10:32:50 2

to be stored in logfile. However, when the logfile has unprintable characters in in. How do I get this kind of output from the command li

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Ubuntu :: Netcat Output Pipes And Redirection ?

May 25, 2010

I'm trying to redirect nc command output but I can't do it.

I have tried this:

And this:

But it seems doesn't work.

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Programming :: Store A Command In A Variable?

Jan 28, 2010

Code:

ls Again the command can be stored in a variable and then executed. Like

Code:

var=ls
&var

The above two codes are the same. The problem occurs when we try to pipeline it. Consider the following problem:

Code:

ls | grep *

works fine...but when we try to store it in a variable and run the command there is an error.

Code:

var="ls|grep *"
$var

how to store this kind of commands in a variable?

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Programming :: Using Variable To Store Command Lines In A Pipeline?

Jan 28, 2010

Was trying to write a shell script that has if conditional statements to decide different arguments for a command.Basically:

Code:
if [ "$1" = 1 ]
then

[code]...

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General :: Program That Reads Multiple Pipes / File Descriptors And Writes To Standard Output

Feb 23, 2011

Is there already a program that reads multiple pipes or file descriptors and writes to the standard output (not splitting lines).Like cat, but reading all files simultaneously and preserving lines.It is needed to avoid coding of select/epoll loops or using multithreading in simple programs. Like "select loop for bash".

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Programming :: Show The Output Of Shell Command Into A Textbox, Ex Ps -efc Command?

Oct 20, 2010

I am using gtk to program GUI. How can I show the output of shell command into a textbox, ex ps -efc command ?

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Programming :: Difference Between Message Queues And Named Pipes

Mar 1, 2011

recently I had been to interview where I had a question to be answered, that what are advantages and disadvantages when desiging an application in linux.

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Programming :: Using Sed To Modify Command Output?

Jun 13, 2010

The output of a command changed and I need to extract the data and print it out in a different fassion:

Code:
abcd1=aaaa xx
abcd 2 aaa xx bbb
abcd2=aaaa xy
ab 2 xx aaa bbb ccc xxx
should be transformed to:

[Code]...

Currently I used sed "search1|search2|search3" to get the lines that need to be transformed. But I also need to search for substrings in those lines and I need to print those substrings in a specific order together with other characters. How is this done with sed?

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Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

Mar 9, 2011

I am trying to grep multiple numbers from file, grep does have the -f option for that.

Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with

Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?

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Programming :: Echo Two Command Output In The Same Line?

Jan 25, 2011

I try to write script and echo two command at the same line .

echo "A"
echo "B"

How can I pipe above two command at the same line in text file . So, in the output text file , you can see below ? Code: A B not Code: A B

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Programming :: Diverting IDL Output To The Command Line?

Jul 14, 2010

I'm troubleshooting a batch of scripts I'm modifying, including an IDL script called by a .csh script. the IDL scripts were provided to me by a coworker and my .csh script is intended to automate a lengthy set of extremely tedious and time consuming processing tasks.

I am currently in the process of debugging, and can't get the IDL to print any messages other than critical failures to the screen. Is there any easy way to redirect the stdout to either a logfile or the screen?

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Programming :: Giving Output Of A Command As The Input To Another

Sep 7, 2010

While making a shell ,there is the following problem Im facing:

I am expecting the user to enter commands in the following format :

I am to separate these and the output of ls -l should be given as input to grep and the output of both to more.

But I am allowed (by our instructor) to use dup/dup2 or any other command(but not pipe or tees).

How to connect the file descriptors after successful execution of each command?

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Programming :: Get String From System Command Output ?

May 15, 2010

I have found this from a site [url]

Code:

But it does not work for me, segfault.

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Programming :: Omit Specified Characters From The Output Of A Command?

Nov 18, 2010

After typing "man cut" in my terminal I can't seem to find this answer.

I am trying to write several shell scripts and want to remove the 'lp:<package name>' from the beginning of each line of the output of "bzr ls" as well as any notices at the beginning of the output, leaving only file and folder paths.

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Programming :: Using Bash Command To Execute Output Of Awk?

Mar 24, 2011

I am trying to process a column separated data file, with a few bash command. For example, I have

Code:

file1 aaaa yes
file2 aaaa no
file3 bbbb yes

Let say I want to create new file with the output of first column and do something else with the output of 3rd column. Of course there are many ways to process this data file, but I wish to know by using awk, how could I do it. I'm trying:

Code:

awk '{system("touch $1")}' datafile

but the shell command will not able to get the awk '$1' output. How do I get this done ? And for another question, if the data file contains the variable name of a shell variable, how could I make use of it during a awk output ? For example I have a datafile1:

Code:

server1 yes
server2 no

And in another server declaration data file, I got this datafile2:

Code:

server1=xxx1
server2=yyy1

And in my awk script, I want to achieve something like (the syntax is definitely wrong, just to demonstrate what I assume it will like):

[code]....

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Programming :: Assigning Output Of A Command To An Array In Perl?

Nov 25, 2010

I am trying to execute a Unix Command in perl and assigning its output to an array:

Code:
@File_List=exec("ls -1 /tmp");
but it is not working. I have tried the perl function system() also but its return code is

[code]...

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Programming :: Direct Standard Output From Find Command?

Mar 26, 2010

I'm trying to pull out sections from a bunch of files. For one file, I use:

Code:
sed '/string1/,/string2/ !d' <filename.ext >newfilename.ext
to pull out everything between two strings in the original file and put them in a new file.

[code]....

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Programming :: Organize Bash Script Output Of Which Is Like On Top Command

Sep 12, 2010

Is it possible to organize bash script output of which is like on top command i.e. monitoring every let's say 1 sec and old information would cleared?

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Programming :: Retrieving And Organizing Data From Command Output?

Mar 31, 2011

I was messing around with Bash scripting just now and was wondering if there was a way to organize the output of a command into an array. Like the Bash equivalent of the PHP explode() function.

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Programming :: Sort Command Output Differs When Encounters?

Mar 18, 2010

Here is what I am doing I have a file, a.txt for example, with following contents:

Code:
coreutils install
cpio install
cpp install
cpp-4.3 install
dbus install

[Code]...

So it seems like the sorting algo. for dpkg --get-selections is different than sorting algo. of 'sort' command when it encounters "-" (hyphen). How can I sort the original file (a.txt) in such a way that it produces the output file ,b.txt, exactly the same.

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General :: Need To Store Output Of Bitset() In A Variable / Possible In C++?

Mar 5, 2010

I need to store the output of bitset() in a variable ... is it possible in c++?

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Programming :: Reading Command Output By Line In Bourne Script?

Feb 13, 2010

I have a command which generates the following output:

Code:
$ sudo vnconfig -l
vnd0: not in use

[code]...

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Programming :: Creating Array From Command Output (Bash Shell Script)

Jan 26, 2011

I have a command that outputs n lines of text, and I want to place each line into an array element, but I can't seem to get the syntax correct

So my command is this:
cat $configfile | sed -n '/cluster:'$clustername'/,/cluster/ p' | awk /host/

Which produces many lines depending on the value of $clustername. I'd like to get each line as elements of an array.

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Ubuntu :: Store Expect Standard Output To Excel File?

Mar 16, 2011

I am working on telnet session and excuting commands. I am able to redirect or store expect output to log file but now i want to store in excel file like ispreadsheet showing details of commands and its responses

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Programming :: Find Command With Standard Error Output And Mail Error File

Nov 11, 2010

We make everyday a DB Mysql backup on Linux redhat Enterprise. We are using a bash shell script (and putting it in the crontab) to execute it automatically everyday. We added a line to this script telling, once the backup has completed, to find old backup files (stored on hard disk after each backup) older than x days to remove them. We use the find command (search for file type) with the mtime option and in combination with rm command. Everything runs ok but we also want to add some new code to the same line: If find command cannot find anything or fails, for example if it cannot delete file or fails, send the error message (standard error output) to an error file (like error000001 and increasing) and mail the errorxxxx file to an email address for example to admin@companyname.com. What would be the code for this issue to add it to our find command in the same bash shell script??

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Programming :: Storing Output Of "time" Command To A Variable

Jan 21, 2011

In my script, I need to get execution time of a command (say 'ls') in mili seconds level. For this i tried using "time" command to retrieve the total execution time in milli seconds. But, the problem is that, how to save the output of time command in a variable. The format of the command is like "time ls -R /opt" Going further, the o/p of 'time' command is:

real 0m0.003s
user 0m0.004s
sys 0m0.000s

Here, in my script, I would like to use only middle line "user 0m0.004s" saved to the variable but unable to find out the way.

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