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Full Discussion: Substring in shell script
Top Forums Shell Programming and Scripting Substring in shell script Post 302158892 by rene_metaal on Wednesday 16th of January 2008 02:38:00 PM
Old 01-16-2008
It can be simple and it might be needed to do some checks on the data.

In this example I used grep to make sure it is a line with a comma and
assuming it is a line with data to be converted.

grep , inputfile | tr , _ | while read LINE; do echo $LINE.jpg; done

Or with awk:
awk -F, '{ print $1_$2".jpg" }' inputfile

If you want to make it more flexible I would use "while read ...."
cat inputfile | while read LINE
do
.....
done

--- I hope this answers your question ---
-René
 

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MKERRLST(1)						      General Commands Manual						       MKERRLST(1)

NAME
mkerrlst - create system error file SYNOPSIS
mkerrlst [ -i inputfile ] [ -o outputfile ] DESCRIPTION
Mkerrlst(1) creates error message files in the format described by syserrlst(5). With no arguments mkerrlst creates the file /etc/syserrlst from the internal array sys_errlist. Give just the -o option mkerrlst will create the file outputfile from the internal array sys_errlist. Given just the -i option mkerrlst will create the file /etc/syserrlst from the input file inputfile. Given both -i and -o options mkerrlst will create the error message file outputfile from the strings contained in inputfile. NOTE: error messages are numbered from 0. If the error 0 does not have a message associated with it the first string in inputfile must still be present. RETURN VALUE
mkerrlst exits with status of 0 if no errors are encountered. If errors do occur an error message is printed on stderr and the exit status is 1. ERRORS
mkerrlst(1) can encounter any of the errors for the open(2), lseek(2), read(2), or write(2) system calls. SEE ALSO
syserrlst(3) syserrlst(5) HISTORY
mkerrlst(1), first appeared in 2.11BSD. BUGS
Error messages can be a maximum of 80 characters. 3rd Berkeley Distribution March 14, 1996 MKERRLST(1)
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