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Shell Programming and Scripting

substr issue

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# 1  
Old 09-01-2010
substr issue
Hi

I have a script:
Code:
 
ls -l | grep "$TDATE" | awk '{print $NF}' > todays_files.txt
for run in $(cat todays_files.txt)
do
 SSTR='expr substr "$run" 1 5'
 echo "$SSTR"
done

I want 1 to 5 chars of each files.

It returns instead for all files.

Code:
'expr substr "$run" 1 5'


Could someone help me to fix the issue?

Thanks
# 2  
Old 09-01-2010
Code:
a="abcdefg"
echo ${a:0:5}

output:
abcde

# 3  
Old 09-01-2010
Try this instead of the loop:
Code:
ls -l | awk -v d="$TDATE" '$0 ~ d{print substr($NF,1,5)}'

This User Gave Thanks to Franklin52 For This Post:
dipeshvshah
# 4  
Old 09-01-2010
MySQL
Thanks Franklin & Icon.
# 5  
Old 09-01-2010
You can also pipe the output from the awk to a code block { } around your loop and avoid writing to a file.

Code:
 
ls -l | grep "$TDATE" | awk '{print $NF}' |
{ while read run; do 
     echo ${run:0:5}
done }

read run not only reads the line but also evaluates to FALSE when it can't read the next to last line breaking while the look at the top.
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