Revision [538]

This is an old revision of HowToConditional made by DavidLee on 2009-05-21 18:53:46.


How To test a condition

Conditions can be tested with either the boolean operations "
" and "&&" or with the the if/elif/else/then clauses.

Boolean Operations

If you only need execute a single command or a small block then boolean operations are the easiest way

for example

if "command" returns successfully then print "is success"

$ command && echo is success

If the file "myfile.txt" exists then read the first line from the file and print it.

$ [ -e myfile.txt ] && { read VAR < myfile.txt ;  echo $VAR ; }

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