Testing On Unix

[saikrishnaa]

can you guide me how to test in unix

[moonlight]

Test is a condition evaluation command.The test command evaluates the expression if the value is True,returns a zero exit status; otherwise,a nonzero exit status is returned.test also returns a nonzero exit status if there are no arguments.

[Sandhya.Kishannag]

We can test in UNIX with the help of commands along with some test conditions.They returns 0 for true and 1 for false.

Syntax:test - either test condition or [ condition ]

Strings are compared with =, !=, >, and <.
For example, test "$1" = "yes" is true if $1 is "yes".

Numbers are compared with -eq (equal), -ne (not equal), -lt (less than), -le (less than or equal), -gt (greater than), -ge (greater than or equal to).
For example, test $1 -lt 4 means that $1 is a number less than 4.

Here are some other conditions:
test -r file True if file file exists and is readable.
test -w file True if file file exists and is writeable.
test -x file True if file file exists and is executable.
test -d file True if file file exists and is a directory.
test -s file True if file file exists and has a size greater than 0.
test -z string True if string string exists is length 0.