I am currently tasked with some reporting on various Unix based OSes. I have a script deployed that runs and grabs the information I am looking for, and has a bit of logic to output the desired result into a text file.
So, the script that runs basically pulls info from a system, parses it to my desired output, then echoes it to a text file where I can later read it and report or take action on it. My idea was to use a while loop to read these values, then build in if then statements to do a task.
example script:
Code:
#!/bin/bash
# while loop example of reading a file
file=/var/reports.txt
cat ${file} | while read line ; do
echo -e ${line};
if [[ multiUsers == "yes" ]]
then echo "has multiple human users"
fi
if [[ availableDiskSpace -lt 20 ]]
then echo "the boot volume has less than 20% free space"
fi
done
exit 0
I have tried numerous ways of doing this, and I honestly hardly ever use while loops so I know there are other ways to do this. Perhaps even better ways, but now that I cannot get it work I am pretty much forcing myself to learn why it is not working.
In my script I would take actions, but the echoes are there as place holders for other commands I may run, as I am in the testing phase.
I am currently tasked with some reporting on various Unix based OSes. I have a script deployed that runs and grabs the information I am looking for, and has a bit of logic to output the desired result into a text file.
So, the script that runs basically pulls info from a system, parses it to my desired output, then echoes it to a text file where I can later read it and report or take action on it. My idea was to use a while loop to read these values, then build in if then statements to do a task.
example script:
Code:
#!/bin/bash
# while loop example of reading a file
file=/var/reports.txt
cat ${file} | while read line ; do
echo -e ${line};
if [[ multiUsers == "yes" ]]
then echo "has multiple human users"
fi
if [[ availableDiskSpace -lt 20 ]]
then echo "the boot volume has less than 20% free space"
fi
done
exit 0
I have tried numerous ways of doing this, and I honestly hardly ever use while loops so I know there are other ways to do this. Perhaps even better ways, but now that I cannot get it work I am pretty much forcing myself to learn why it is not working.
In my script I would take actions, but the echoes are there as place holders for other commands I may run, as I am in the testing phase.
Thanks,
ZB
In your loop you have a variable named line; you do not define the variables multiUsers and availableDiskSpace. So, your if statements will never match what you're looking for.
Try replacing:
Code:
cat ${file} | while read line ; do
echo -e ${line};
if [[ multiUsers == "yes" ]]
then echo "has multiple human users"
fi
if [[ availableDiskSpace -lt 20 ]]
then echo "the boot volume has less than 20% free space"
fi
done
with something like:
Code:
while IFS='=' read var val
do printf "%s=%s\n" "$var" "$val"
if [ "$var" == "multiUsers" ] && [ "$val" == "yes" ]
then echo "has multiple human users"
fi
if [ "$var" == "availableDiskSpace" ] && [ "$val" -lt 20 ]
then echo "the boot volume has less than 20% free space"
fi
done < "$file"
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