csh/C shell scripts: if statement syntax
Contributed by Rex 
Tagged: csh shell scripting Conditional expressions give programs life. The ability to branch makes shell scripts powerful. This recipe shows the basic if then else structure for csh, the C shell.
Basic if statement syntax:
if (condition) then
commands
endif
The addition of one or more else keywords offers additional flexibility:
if (condition) then
commands
else if (other condition) then
commands
else
commands
endif
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Dan said on November 7, 2008
test for the existence of a variable using
if ($?LD_LIBRARY_PATH == 0) then
setenv LD_LIBRARY_PATH /usr/lib;
endif
Dan said on March 11, 2009
Without concrete examples of how the syntax is actually used, this is almost useless information.
Dan said on March 11, 2009
A variation of the above would be:
if ( ! ${?LD_LIBRARY_PATH} ) then
setenv LD_LIBRARY_PATH /usr/lib
endif
Use the {} around variables as a habit since the variable names can often interfere with shell syntax.
The semicolon at the end is ignored.
Paul said on December 14, 2009
Almost? More like completely…
Chisimobi said on March 23, 2011
need more examples
Chisim_obi said on March 23, 2011
need more examples