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up vote 1 down vote favorite

I was tasked to create an automated server hardening script and one thing that they need is a report of all the output of each command executed. I want to store the error message inside a string and append it in a text file.

Let's say I ran this command:

/sbin/modprobe -n -v hfsplus

The output of running this in my machine would be:

FATAL: Module hfsplus not found

How can I store that error message inside a string? Any help would be greatly appreciated. Thanks!

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I tried running this command: var=$(/sbin/modprobe -n -v hfsplush) And then displaying it: $var But it still doesn't capture the error message inside the string. –  Miguel Roque yesterday
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3 Answers

up vote 4 down vote

Simply to store as a string in bash script:

X=`/sbin/modprobe -n -v hfsplus 2>&1`
echo $X

This can be a bit better as you will see messages when command is executed:

TMP=$(mktemp)
/sbin/modprobe -n -v hfsplus 2>&1 | tee $TMP
OUTPUT=$(cat $TMP)
echo $OUTPUT
rm $TMP
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up vote 3 down vote

you can do it by redirecting errors command:

/sbin/modprobe -n -v hfsplus 2> fileName

as a script

#!/bin/bash
errormessage=$( /sbin/modprobe -n -v hfsplus 2> &1)
echo $errormessage

or 

 #!/bin/bash
errormessage=`/sbin/modprobe -n -v hfsplus 2> &1 `
echo $errormessage

if you want to append the error use >> instead of >

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I've tried that approach and it stores it DIRECTLY in the text file. I want it to store inside a string first so I can format the contents easily. –  Miguel Roque yesterday
1  
@MiguelRoque see updates –  Networker yesterday
1  
I tried putting the output inside a HEREDOC and it worked also. Thanks a lot @Networker! –  Miguel Roque yesterday
    
@graphite thanks edited –  Networker yesterday
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up vote 1 down vote

To append to a file use /sbin/modprobe -n -v hfsplus 2>> filename

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