Shell Programming and Scripting

Hi I have created the following shell script file with the following content.

Code:

#!/bin/csh
set VAR1="abcxyz" << EOF
EOF
echo "---------------------"
echo "VAR1 = $VAR1"
echo "---------------------"

i am not able to echo the previously set VAR1.

Can any one suggested what could be wrong?

Thanks,
Srinivas

Leave the << EOF and EOF out.

In addition to @zaxxon , please post what you typed to run the script and what exact output you saw. Even with the spurious <<EOF and EOF, the script still works on my system.

Please also post what Operating System and version you are running.

Note: It is quite unusual for anybody to use C-Shell nowadays.

Hi All, Thanks for quick reply.

I resolved the issue some how as mentioning below.

I just knocked off <<EOF and EOF statements and ran the following

Code:

#!/bin/csh
set VAR1="abcxyz"
echo "---------------------"
echo "VAR1 = $VAR1"
echo "---------------------"

First i ran with the following shell command without adding +x bit on sh file.

Code:

> sh test1.sh

the out put i got as

---------------------

Code:

VAR1 =

---------------------

Then i tried adding +x bit on the sh file and ran the following

Code:

> ./test1.sh

output came as expected.

---------------------

Code:

VAR1 = abcxyz

---------------------

I don't clearly got the point here. what is the difference between the previous ran command
and the later one?

Thanks,
Srinivas

Moderator's Comments:

Please use code tags next time for your code and data.

so far you have not been setting an environmental variable, only a C-shell variable. You need to use "setenv" to set an environmental variable in the C-shell.

When you invoked the script with sh test1.sh the Shebang line is ignored and the script was run with Bourne Shell. The syntax was incorrect for Bourne Shell. It would of course have worked with csh test1.sh.

When you made the script executable and ran it as ./test1.sh the Shebang line was executed and the script ran with C Shell.

Unless you have a very good reason for using C Shell, you will find learning Bourne Shell much more useful in the modern unix and Linux world. All system scripts are Bourne Shell or some enhance form of Bourne Shell.