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#1
March 19th, 2007, 12:13 PM
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Substition unix script help needed
I need to create a shell script, that will search for a string and make a substitution and a backup file, but only if string is found in the file. Can anybody help me. So far I have tried:
#!/bin/csh set firstargument=$1 set secondargument=$2 set filename=$3 grep $firstargument $filename if (true)then sed "s/firstaurgument/secondargument/g" $filename.bak > $filename mv $filname $filename.bak endif -------------------------------------- #!/bin/csh set firstargument=$1 set second argument=$2 set filename=$3 if (grep $firstargument $filename)then mv $filename $filename.bak sed "s/firstargument/secondargument/g" $filename.bak > $filename else endif If you can oofer any help please do.
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#2
March 19th, 2007, 01:55 PM
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I prefer not to use csh, preferring a POSIX-compliant(ish) one, like bourne or korn.
Code:
#!/usr/bin/ksh firstargument=$1 secondargument=$2 filename=$3 found=`grep -c "$firstargument" $filename` if [ $found -ne 0 ] then sed "s/$firstaurgument/$secondargument/g" $filename.bak > $filename mv $filname $filename.bak fi All of which pre-supposes that you have a $filename.bak
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