pvinodp
asked on
How to add lsof with pipe and awk to a array variable?
I have to populate a array which will be commands and I would run them in a loop to execute the commands:
for i in "${cmd_array[@]}"
do
${i} >> $logFile
done
Populating the command-array:
cmd_array=("cat /proc/${process_pid}/statu
cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$4 } { if ( user == $fileType ) { print } }' | sort -nrk 7 | head -100"
I get the following error when i execute the cmd_array[1]:
lsof -s -p 5573 '|' awk ''\''{' user = '$4' '}' '{' if '(' user == mem ')' '{' print '}' '}'\''' '|' sort -nrk 7 '|' head -100
lsof: status error on |: No such file or directory
lsof: status error on awk: No such file or directory
lsof: status error on '{: No such file or directory
lsof: status error on user: No such file or directory
lsof: status error on =: No such file or directory
lsof: status error on $4: No such file or directory
lsof: status error on }: No such file or directory
lsof: status error on {: No such file or directory
lsof: status error on if: No such file or directory
lsof: status error on (: No such file or directory
lsof: status error on user: No such file or directory
lsof: status error on ==: No such file or directory
lsof: status error on mem: No such file or directory
lsof: status error on ): No such file or directory
lsof: status error on {: No such file or directory
lsof: status error on print: No such file or directory
lsof: status error on }: No such file or directory
lsof: status error on }': No such file or directory
lsof: status error on |: No such file or directory
lsof: status error on sort: No such file or directory
lsof: status error on -nrk: No such file or directory
lsof: status error on 7: No such file or directory
lsof: status error on |: No such file or directory
lsof: status error on head: No such file or directory
lsof: status error on -100: No such file or directory
How to process lsof commands this way?
for i in "${cmd_array[@]}"
do
${i} >> $logFile
done
Populating the command-array:
cmd_array=("cat /proc/${process_pid}/statu
cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$4 } { if ( user == $fileType ) { print } }' | sort -nrk 7 | head -100"
I get the following error when i execute the cmd_array[1]:
lsof -s -p 5573 '|' awk ''\''{' user = '$4' '}' '{' if '(' user == mem ')' '{' print '}' '}'\''' '|' sort -nrk 7 '|' head -100
lsof: status error on |: No such file or directory
lsof: status error on awk: No such file or directory
lsof: status error on '{: No such file or directory
lsof: status error on user: No such file or directory
lsof: status error on =: No such file or directory
lsof: status error on $4: No such file or directory
lsof: status error on }: No such file or directory
lsof: status error on {: No such file or directory
lsof: status error on if: No such file or directory
lsof: status error on (: No such file or directory
lsof: status error on user: No such file or directory
lsof: status error on ==: No such file or directory
lsof: status error on mem: No such file or directory
lsof: status error on ): No such file or directory
lsof: status error on {: No such file or directory
lsof: status error on print: No such file or directory
lsof: status error on }: No such file or directory
lsof: status error on }': No such file or directory
lsof: status error on |: No such file or directory
lsof: status error on sort: No such file or directory
lsof: status error on -nrk: No such file or directory
lsof: status error on 7: No such file or directory
lsof: status error on |: No such file or directory
lsof: status error on head: No such file or directory
lsof: status error on -100: No such file or directory
How to process lsof commands this way?
SOLUTION
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Try
eval ${i} >> $logFile
And wouldn't the user appear in column 3, thus requiring "$3" instead of "$4" in awk?
Next, you're missing (escaped) double quotes here:
if ( user == \"$fileType\" )
Strings must be quoted in awk so that they can be distinguished from variables.
cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$3 } { if ( user == \"$fileType\" ) { print } }' | sort -nrk 7 | head -100"
eval ${cmd_array[1]}
In your (and the above) version process_pid and fileType must be set before populating the array. Is this desired?
eval ${i} >> $logFile
And wouldn't the user appear in column 3, thus requiring "$3" instead of "$4" in awk?
Next, you're missing (escaped) double quotes here:
if ( user == \"$fileType\" )
Strings must be quoted in awk so that they can be distinguished from variables.
cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$3 } { if ( user == \"$fileType\" ) { print } }' | sort -nrk 7 | head -100"
eval ${cmd_array[1]}
In your (and the above) version process_pid and fileType must be set before populating the array. Is this desired?
ASKER
is there anything wrong or is it not the optmized way?
Once the suggested corrections have been made there's nothing wrong anymore. Using "eval" the command should run as desired (see my note about populating variables, however).
To be able to ponder what the "optimitzed" way might be I'll need much more info what you're actually trying to achieve, and in which context.
I don't understand what this
cmd_array=("cat /proc/${process_pid}/statu
should be good for.
The statement will fill ${cmd_array[0]} with all the stuff from the status part of the process entry in /proc, which is not at all related to the lsof command you posted. ${cmd_array[0]} will not contain a command, so running it will always produce errors, even with "eval".
To be able to ponder what the "optimitzed" way might be I'll need much more info what you're actually trying to achieve, and in which context.
I don't understand what this
cmd_array=("cat /proc/${process_pid}/statu
should be good for.
The statement will fill ${cmd_array[0]} with all the stuff from the status part of the process entry in /proc, which is not at all related to the lsof command you posted. ${cmd_array[0]} will not contain a command, so running it will always produce errors, even with "eval".
ASKER
I am doing a performance analysis of a particular process id .
i need to execute "cat /proc/pid/status" and "lsof ****" .
how can i proceed?
i need to execute "cat /proc/pid/status" and "lsof ****" .
how can i proceed?
Do you want to run the analysis against a specific pid/user combo, or how should pid and user be selected?
What do you actually mean with "user" in your script? The username as displayed by lsof in column 3, or perhaps something different?
What do you actually mean with "user" in your script? The username as displayed by lsof in column 3, or perhaps something different?
ASKER
user is just a placeholder .. The variable can have any name.
i want to measure against particular pid
I am given the pid for whcih i have to measure.
The code to run the commands is comon. i have a array of commands for certain type of pids.
For one such pid there is 2 commands:
1. cat /proc/pid/status
2. lsof ****
the actual problem is that i am unable to append the eval output to a file.
THat is my next question. Can someone answer with that perspective?
i want to measure against particular pid
I am given the pid for whcih i have to measure.
The code to run the commands is comon. i have a array of commands for certain type of pids.
For one such pid there is 2 commands:
1. cat /proc/pid/status
2. lsof ****
the actual problem is that i am unable to append the eval output to a file.
THat is my next question. Can someone answer with that perspective?
You know that lsof can output just couple of fields without header?
SOLUTION
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ASKER
I changed the command from using a variable to use a static constant.
if ( user ~"'$fileType'" ) is changed to if ( user ~"mem" )
what is the difference between == and ~
if ( user ~"'$fileType'" ) is changed to if ( user ~"mem" )
what is the difference between == and ~
ASKER CERTIFIED SOLUTION
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ASKER
Thanks for your response
ASKER
What do u mean by escaping pipe command.
cmd_array[1]="lsof -s -p $process_pid | awk '{ user = \$4 } { if ( user == $fileType ) { print } }' | sort -nrk 7 | head -100"
Above is my oroginal command.
But when i try to execute it by :
for i in "${cmd_array[@]}"
do
${i} >> $logFile
done
I get the following error:
lsof -s -p 5573 '|' awk ''\''{' user = '$4' '}' '{' if '(' user == mem ')' '{' print '}' '}'\''' '|' sort -nrk 7 '|' head -100