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# 1  
Old 06-01-2016
Using sed inside shellscript
Hi All,

I am trying to use sed command inside a shell script.
The same sed command is working on command line, however its not working while using inside a shell script.
From various sources i found , it could be done by using -i option, but its not working as well.

Code:
sed 's/something/otherone/g' inputfile

its working perfectly filne while using on command line.

Code:
#! /bin/ksh
sed 's/something/otherone/g' inputfile
#/usr/bin/sed 's/something/otherone/g' inputfile
#/usr/bin/sed 's/something/otherone/g' full/path/inputfile

Tried using absolute path of sed, and inputfile but still its not working.
ANy pointer on this please.

NOTE: I am using SunOS

Thanks
Goutam
# 2  
Old 06-01-2016
Quote:
Originally Posted by gotamp
Hi All,
I am trying to use sed command inside a shell script.
The same sed command is working on command line, however its not working while using inside a shell script.
From various sources i found , it could be done by using -i option, but its not working as well.
Code:
sed 's/something/otherone/g' inputfile

its working perfectly filne while using on command line.
Code:
#! /bin/ksh
sed 's/something/otherone/g' inputfile
#/usr/bin/sed 's/something/otherone/g' inputfile
#/usr/bin/sed 's/something/otherone/g' full/path/inputfile

Tried using absolute path of sed, and inputfile but still its not working.
ANy pointer on this please.
NOTE: I am using SunOS
Thanks
Goutam
Hello gotamp,

If I am seeing it correctly you have space in between #! and /bin/ksh in your shebang, try without the space as #!/bin/ksh and let me know how it goes then.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
gotamp
# 3  
Old 06-01-2016
Thanks R.Singh for correctly pointing it out.
I have done the changes accordingly, but still it does not work.
Not sure, if sed could be used this way inside a shell script.

THanks
Goutam
# 4  
Old 06-01-2016
Any error messages? Run with -x option set and post the result...
# 5  
Old 06-01-2016
Hi RudiC

Please find my shell script that uses sed
Code:
#!/bin/ksh
a=$1
b=$2
echo "a is $a , b is $b"
/usr/bin/sed 's/$a/$b/g' /user/iomaint/tempo/gtm/sed/filetosedreplace

and this is the data contained in the file filetosedreplace
Code:
D1: cat /user/iomaint/tempo/gtm/sed/filetosedreplace
the one should be replaced with ONE

and now, this is the output when i run the script in debug mode
Code:
D1: sh -x sedinshell.ksh one ONE
a=one
b=ONE
+ echo a is one , b is ONE
a is one , b is ONE
+ /usr/bin/sed s/$a/$b/g /user/iomaint/tempo/gtm/sed/filetosedreplace
the one should be replaced with ONE

additional info
Code:
D1: uname -a
SunOS simsun2 5.10 Generic_150400-13 sun4u sparc SUNW,SPARC-Enterprise

# 6  
Old 06-01-2016
Quote:
Originally Posted by gotamp
Hi RudiC

Please find my shell script that uses sed
Code:
#!/bin/ksh
a=$1
b=$2
echo "a is $a , b is $b"
/usr/bin/sed 's/$a/$b/g' /user/iomaint/tempo/gtm/sed/filetosedreplace

and this is the data contained in the file filetosedreplace
Code:
D1: cat /user/iomaint/tempo/gtm/sed/filetosedreplace
the one should be replaced with ONE

and now, this is the output when i run the script in debug mode
Code:
D1: sh -x sedinshell.ksh one ONE
a=one
b=ONE
+ echo a is one , b is ONE
a is one , b is ONE
+ /usr/bin/sed s/$a/$b/g /user/iomaint/tempo/gtm/sed/filetosedreplace
the one should be replaced with ONE

additional info
Code:
D1: uname -a
SunOS simsun2 5.10 Generic_150400-13 sun4u sparc SUNW,SPARC-Enterprise

Hello gotamp,

You are passing variables to the script, so could you please try following(haven't tested though).
Code:
/usr/bin/sed 's/'${a}'/'${b}'/g' /user/iomaint/tempo/gtm/sed/filetosedreplace
OR
/usr/bin/sed 's/"{$a}"/"{$b}"/g' /user/iomaint/tempo/gtm/sed/filetosedreplace

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
gotamp
# 7  
Old 06-01-2016
Your samples in post#5 show a TOTALLY different picture that you have in post#1!

Within single quotes, the shell does NOT expand variables, so sed 's/$a/$b/g' tries to replace the string constant "$a" (which, of course, is not found in your file) with the string constant "$b" - as you can see in your xtrace output as well. Try double quotes instead, or the proposal by RavinderSingh13.
This User Gave Thanks to RudiC For This Post:
gotamp
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