compare files in C shell

shashwat.gupta · 05-23-2006, 01:55 AM

Hi all,
I want to do compare to files in C shell script but when I try to do it by
if( cmp -s shell.tmp shell) then it starts giving me error that its an if syntax error so I guess cmp is not part of C shell ( same script is working when i wrote it for bash ).
Despite seaching internet a lot I am not able to find out how to compare two file in C shell script .
Any help will be appreciated

chrism01 · 05-23-2006, 03:38 AM

cmp is an external prog eg man cmp. I suspect you need to be more careful with the C shell syntax; try this page: docs.freebsd.org/44doc/usd/04.csh/paper.pdf or specify bash as the first line eg:
#!/bin/bash

shashwat.gupta · 05-23-2006, 04:26 AM

Thanx buddy
I am very Thankful to you it was really nice help

shashwat.gupta · 05-23-2006, 08:56 AM

As asked by the chrism01 I have studied that particular document but its still giving me error. so i am still facing some problems.
i am putting complete shell script this shell script is working if I put the #!/bin/bash instead of #!/bin/csh
this file is completely according to as that document specify ... to be more specific if i put the $hello == 0 instead of cmp -s shell shellcopy then it works well

#!/bin/bash

cat make_version_h > shell.tmp
if (cmp -s shell shellcopy) then
echo "Matched file"
else
echo "Not matched file"
fi

any help will be quiet useful to me

I am sorry for my dumbness.actually I am very new to shell scripts

spirit receiver · 05-23-2006, 11:07 AM

How about this?

Code:

cmp -s shell shellcopy
test=$?

if [[ "$test" -eq "0" ]]
then 
    echo "files are equal"
elif [[ "$test" -eq "1" ]]
then
    echo "files differ"
else
    echo "something went wrong"
fi

Oh, I just noticed that there's only one thing wrong with your file: try

Code:

if (cmp -s shell shellcopy); then

shashwat.gupta · 05-23-2006, 12:01 PM

Thanks for your reply
but ur method is working when I put the #!/bin/bash on top of file but if I put #!/bin/csh on file then it says it says

if: Expression Syntax.

I am not getting why this problem is coming .. actually I want to compare two files in C shell.

again thanks for your reply and Informative post

spirit receiver · 05-23-2006, 03:02 PM

OK, so

Code:

#! /usr/bin/csh

cmp -s shell shellcopy
set TEST = $status

if ( "$TEST" == "0" ) then 
    echo "files are equal"
else if ( "$TEST" == "1" ) then
    echo "files differ"
else
    echo "something went wrong"
endif

or

Code:

#! /usr/bin/csh

if ( { cmp -s shell shellcopy } ) then 
    echo "files are equal"
else
    echo "nope"
endif

chrism01 · 05-23-2006, 10:08 PM

Exactly; differnet shells have different syntaxes for certain stuff eg 'if' cmds are a classic example, which is why I ref'd that doc.
If it works when specifying bash shell, why not do it that way? ie Why use C-shell at all, it's pretty old.

shashwat.gupta · 05-24-2006, 03:13 AM

Thanks every One for very Important help.