I am trying to execute the following shell script
#!/bin/csh
if [[ $# != 1 || $1 != "first" && $1 != "second" ]]
then
echo "Error: Usage: $0 [first|second]"
exit 1
fi
but I am getting an error:
if: Expression Syntax.
I have no idea what's wrong with that syntax. It looks fine to me. please help.
The C shell (csh) doesn't have the variable $#. In fact, in csh the arguments passing, if statement etc are fundamentally different to say, ksh or bash. All your code looks like a bash code but your shebang line contains csh. So if you want to use bash then change it to:
#!/bin/bash
if [[ $# != 1 || $1 != "first" && $1 != "second" ]]
then
echo "Error: Usage: $0 [first|second]"
exit 1
fi
Or if you really wanted to use csh then you have re-write the code to:
#!/bin/csh
if ( $#argv != 1 || $1 != "first" && $1 != "second" ) then
echo "Error: Usage: $0 [first|second]"
exit 1
endif
If you use C-shell you should write
#!/bin/csh
if( $# != 1 || $1 != "first" && $1 != "second" ) then
echo "Error: Usage: $0 [first|second]"
exit 1
endif
Your version works for Bourne-like shells like sh, bash etc.
