\section if if - Conditionally execute a command \subsection if-synopsis Synopsis <tt>if CONDITION; COMMANDS_TRUE...; [else; COMMANDS_FALSE...;] end</tt> \subsection if-description Description <tt>if</tt> will execute the command CONDITION. If the condition's exit status is 0, the commands COMMANDS_TRUE will execute. If it is not 0 and <tt>else</tt> is given, COMMANDS_FALSE will be executed. Hint: use <a href="#begin"><tt>begin; ...; end</tt></a> for complex conditions. \subsection if-example Example <pre> if test -f foo.txt echo foo.txt exists else echo foo.txt does not exist end </pre> will print <tt>foo.txt exists</tt> if the file foo.txt exists and is a regular file, otherwise it will print <tt>foo.txt does not exist</tt>.