Conditional Statements with if

login and cshrc files" 1070 is the use of conditionals (if statements). This article explains the syntax of if statements. Article of explains the syntax of the expressions you can test with an if.

The if command is used to begin a conditional statement. The simple format is:

if (expr) cmd

There are three other possible formats, shown side-by-side:

if (expr) then if (expr) then if (expr) then cmds cmds1 cmds1 endif else else if (expr) then cmds2 cmds2 endif else cmds3 endif

In the simplest form, execute cmd if expr is true; otherwise do nothing (redirection still occurs; this is a bug). In the other forms, execute one or more commands. If expr is true, continue with the commands after then; if expr is false, branch to the commands after else (or after the else if and continue checking). For example, the following if clause will take a default action if no command-line arguments are given:

if ($#argv == 0) then echo "No filename given. Sending to Report." set outfile = Report else set outfile = $argv[1] endif

For more examples, see article .

- DG from Anonymous' UNIX tutorial (SVR4/Solaris)