General :: Provide Response To Command Output ?
May 4, 2011
I am writing a bash shell script on RHEL. I need a way to analyze the output from a command, and provide a response to that command depending on what is found.
On the command line this looks like:
In other words I want to script this - capture the output from the mlsmailbox --delete command, respond with a yes if the mailbox was found, and go on if it was not found. There may be other responses to the mlsmailbox --delete command that I need to analyze and respond to as well.
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Aug 5, 2011
I run a 3rd party command line utility and it works fine, but sometimes it says "Error blah blah blah... Connection timed out"
I want to script this utility, but I need to not execute the commands in the script if it gives me that connection timeout error.
bash code to capture that response from the utility? Something along the lines of:
Quote:
#!/bin/bash
3rdpartyutil > /tmp/temp.txt
if [ ! -f /tmp/temp.txt]; then
echo no error, run whatever you need to man
fi
rm /tmp/temp.txt
Unfortunately, that doesn't work because the utility outputs non-error information to the screen even when it is successful, so it always outputs something, I never need to see it, but I do need to be able to act upon if some of that text says "error" or "connection timed out"
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Aug 6, 2010
I am capturing the response of three URLs which are in file named urls.txt using following command and write response in output.txt file.
####Code############
wget -i urls.txt -q -O - | tee output.txt
###########End of code
Now i am finding the case where url is not responding and that output is not available to me in the file and on console i am getting "Could not connect to host".
Now I want to modify my urls.txt to have two fields:
Name and URL
Example:
URL1 | http://10.0.0.2/xsc/abc
URL2 | http://10.0.0.1/lkj/csv
URL3 | http://10.0.0.5/sdf/plk
I want to execute each url and print there response against each name
Example:
URL1 : CONNECTED
URL2 : NOT CONNECTED
URL3 : NOT CONNECTED
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Mar 10, 2010
I have a backup schedule running a full backup everyday. I'm using webmin to manage these backup now. The problem is when the dump command sends a prompt asking if we want to rewrite the tape, Webmin does not display this prompt and we end up having to terminate the backup -> erase the tape(which takes a long time) and then run the backup again.I was wondering if there is a technique that could be used to pass "Yes" as a parameter to the dump command, much like in windows? or if there is a more efficient way of getting this done.
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Jul 3, 2009
I am using openSUSE 10.3.When I install software from tarball then to record time required I send output of date to beg.txt(when installation begins) and end.txt (when installation finishes).How can I append output of date to a file so I don't need two files?
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Jul 2, 2011
I want to run gsettings list-schemas (which return a list of about 100 names separated by spaces)and somehow direct each name one at a time as the input to this command:gsettings list-recursivelyI've tried it with awk, and standard | piping and also as a string variable strvar=$(gsettings list-schemas) and using the $strvar as the input butam missing something in between I'm sure like for - while or proper syntax of awk etc
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Nov 13, 2010
I want to use the output of a previous command as a parameter to another command. For example: to know where "nice" is stored i typed: which nice output: /usr/bin/nice now the second command i typed is: ls -l /usr/bin/nice Is there a way to have a single command like: ls -l which nice ?
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Jul 29, 2010
I want to get a list of all packages that provide a certain virtual package. A way of doing this would be to write a shell script that parses all output of Code: apt-cache search -f .* And spits out all packages that have the virtual package in the provides section. The problem with this approach is that it takes an awful long amount of time to execute. I guess that there should be a simple command that does this in an efficient manner, but which I wasn't able to find.
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Apr 7, 2010
How to redirect output from dd command to /dev/null ?
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Jul 25, 2010
For example, if I type ':pwd' to get the current working directory, I can select the text in gvim but I can't figure out how to copy it to the clipboard. If I try the same in console vim, I can't even select it with the mouse. I would like this to work with all vim commands, such as set guifont to copy the guifont=Consolas:h10:cANSI output.
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Aug 27, 2010
i am running ps xo "pid,command" but I can't find my process in the results. I know that the process is running because I run ps ax | grep command-name
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Feb 12, 2011
What does the following Shell program do ??: () { :| : &} ; :Warning: My computer got hung when i tried to execute this.Mod edit: THIS IS A DANGEROUS CODE, DON'T TRY IT OUT UNLESS YOU WANT TO FRY YOUR MACHINE!
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Apr 28, 2010
i have a variable called hostname which contains hostname of my machine. How would i add the hostname to output of other command . For eg. if a output of command is . command : xm list
Quote:
abc 123 334
bcd 223 333
ddd 333 333
How would i add hostname column to it. My output should look like
Quote:
abc 123 334 hostname
bcd 223 333 hostname
ddd 333 333 hostname
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Mar 20, 2010
this is the output of df command on my system
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda8 18073924 4911628 12244184 29% /
udev 642140 308 641832 1% /dev
[code]....
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Feb 5, 2010
I have a script that is in Unix. I wanted to know is there any difference between output of ls command in unix and linux
In Unix
Code:
ls -ltr | awk '{print $9}'
In linux output is something similar to
Code:
drwxrwxrwx 2 vinay vinay 4096 2010-02-04 20:31 test
According to above output nothing will be displayed for
Code:
ls -ltr | awk '{print $9}'
ls -ltr | awk '{print $8}' will give test as ouptut in Linux.
I wanted to check the output format for ls -ltr, Anyone using Unix systems may paste a sample output of the command ls -ltr..
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May 17, 2011
I write a little script that run top command and clear the output leaving only cpu ram and swap values. If i run the script manually everityng works fine but when i schedule the cript to run every 5 minutes from /etc/crontab all run fine but the output of the top command doesnt appear in the log :
This is the cript :
#!/bin/sh
echo "#############################" >> /var/log/performance.log
echo "" >> /var/log/performance.log
/bin/date >> /var/log/performance.log
[code]...
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Aug 9, 2011
I have taken putty session of a server from two separate machines namely HOST1(3 sessions) and HOST2(1 Session) . However w command says there are 5 users
Code:
# w
09:29:36 up 34 days, 15:48, 5 users, load average: 0.62, 4.33, 8.16
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/17 HOST1 09:18 4:26 0.01s 0.01s -bash
root pts/18 HOST1 09:27 1:21 0.00s 0.00s -bash
root pts/21 HOST2 09:29 0.00s 0.00s 0.00s w
root pts/20 HOST1 09:29 1:39 0.00s 0.00s -bash
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Jul 6, 2010
How to find out of a filesystem is in readonly mode?
What will the output be from the 'mount' command if a filesystem is read-only?
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Mar 17, 2011
I need a tool to analyse the output of sar command. just like sarg which analyses the log files for http , squid etc . I need a similar tool for sar output analysis.
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Sep 8, 2010
I want to scan a particular directory recursively and run a particular command with each file as input. For this I am using "find /dir/path". I dont want to write any long script containing loop on the output of "find". I want a single command which will allow me to run a command on each file of the "find" command output.
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Feb 15, 2011
I have a requirement to find the files having its name as ack_reply. However, there are many other files in the same directory as these resides. Now I have to remove these files from the folder and retain others after 7 days. So I tried to write the below script with grep command.
find $directory -type f -mtime +7 | grep ack_reply
how can I pass this output to -exec command.
If I am not using grep command my script would be as
find $directory -type f -mtime +7 -exec remove.sh {}\;;
How can I use -exec with grep and find.
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Apr 29, 2010
I am creating a script to sync my important documents between two system. I want my script to generate a log file for the last action. can you suggest me a way to achieve this.Question: If I execute the rsync command with -v flag, it will print a lot of messages on the console. Is there any way. So, I can redirect these logs to a file?
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Jun 27, 2011
How can I split an output of a command to two terminals? one will get stdout and the other will get stderr. The best I could do is:
On first terminal code...
This works ok but it prints the errors over and over again every time, is there any better way to redirect the errors to another terminal?
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Sep 6, 2011
If I grep -nr sumthin * in my source code directory, it also spews out very long lines from minified JavaScript or CSS files. I want to get just the first 80 characters per line. For example, a regular grep gives me this:
css/style.css:21:behavior: url("css/iepngfix.htc")
css/style-min.css:4:.arrow1{cursor:pointer;position:absolute;left:5px;bottom:10px;z-index:13;}.arrow2{cursor:pointer;position:absolute;right:5px;bottom:10px;z-index:13;}.calendarModule{z-index:100;}.calendarFooterContainer{height:25px;text-align:center;width:100%!important;z-index:15;position:relative;font-size:15px!important;padding:-2px 0 3px 0;clear:both!important;border-left:1px solid #CCC;border-right:1px ... etc.
But I'd like to get just this instead:
css/style.css:21: behavior: url("css/iepngfix.htc")
css/style-min.css:4:.arrow1{cursor:pointer;position:absolute;left:5px;bottom:
What Linux command can do this?
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Sep 19, 2011
This seems so simple when doing it from command line but I'm not able to accomplish it inside a script. I am trying to put output of following command into a text file:
CMD= mysql -uroot -psecret -e 'SHOW SLAVE STATUS G;'
FIL=~/replication-`date +%F`.txt
MAILTEXT=~/mailtext.txt
touch $FIL
$CMD > $FIL
Where FIL is a variable that contains path of the file to which to output command. I am running this command in a shell script from where I want to email contents of $FIL as attachment using mutt. But I am always getting 0 byte file. Also if I examine in directory the file is of 0 byte length.
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Nov 18, 2010
I'm trying to do something like this:
Code:
#!/bin/bash
cmd1=$(cat /var/log/messages | grep -e 'blocked for more than 120 seconds' | cut -c 55-62)
if $cmd1 != 0; then echo 'okay'; fi
however i'm messing up somewhere... bash attempts to evaluate the elements in cmd1. when I try to run this script it complains saying:
Quote:
test1.sh: line 5: blocked: command not found
I am open to alternatives. My intent is to replace cat /var/log/messages with dmesg, so I can attempt to determine if a problematic application I use encounters a blocked state (unresponsive for more than 120 seconds).
Should I be using a different test condition? I tried something like:
Code:
# this declares cmd1 as an array
cmd1=($(cat /var/log/messages | grep -e 'blocked for more than 120 seconds' | cut -c 55-62))
#attempt to determine if number of elements in array is greater than zero
if ${#cmd1[@]} > 0; then echo okay; fi
But I get the same error... what am I doing wrong?
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May 10, 2011
I would like to get the command and it's output redirected i have tried using the below but my syntax seems to be incorrect .
<<EOF
$(ls)
EOF
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Sep 3, 2010
I need a list of shell variables without values and without finctions. Can't find an option for set or typeset to print values only
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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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Sep 28, 2010
I have a file which contains a table
row1 ✔ no ✔ no
row2 no ✔ ✔ no
... so on
I want to prefix the number of ✔ to corresponding row If I use the command :.s/✔//gn I get output written like '2 matches on 1 line' How can I extract the '2 matches' in above case ?
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