TEST(1)

NAME
test, [ - test for a condition

SYNOPSIS
test expr
[ expr ]

EXAMPLES

DESCRIPTION

Test checks to see if files exist, are readable, etc. and returns an exit status of zero if true and nonzero if false. The legal operators are

	-r file	true if the file is readable
	-w file	true if the file is writable
	-x file	true if the file is executable
	-f file	true if the file is regular file
	-d file	true if the file is a directory
	-c file	true if the file is a character device
	-b file	true if the file is a block device
	-p file	true if the file is a named pipe
	-h file	true if the file is a symlink (always false)
	-L file	synonym for -h (also always false)
	-s file	true if the file exists and has a size > 0
	-t fd	true if file descriptor fd (default 1) is a terminal
	-z s	true if the string s has zero length
	-n s	true if the string s has nonzero length
	s1 = s2	true if the strings s1 and s2 are identical
	s1 != s2	true if the strings s1 and s2 are different
	m -eq m	true if the integers m and n are numerically equal
The operators -gt, -ge, -ne, -le, and -lt may be used as well. These operands may be combined with -a (Boolean and), -o (Boolean or), ! (negation). The priority of -a is higher than that of -o. Parentheses are permitted, but must be escaped to keep the shell from trying to interpret them.

SEE ALSO
expr(1), sh(1).