Plan 9 - man page for test (plan9 section 1)
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test - set status according to condition
Test evaluates the expression expr. If the value is true the exit status is null; other-
wise the exit status is non-null. If there are no arguments the exit status is non-null.
The following primitives are used to construct expr.
-r file True if the file exists (is accessible) and is readable.
-w file True if the file exists and is writable.
-x file True if the file exists and has execute permission.
-e file True if the file exists.
-f file True if the file exists and is a plain file.
-d file True if the file exists and is a directory.
-s file True if the file exists and has a size greater than zero.
-t fildes True if the open file whose file descriptor number is fildes (1 by default) is
the same file as /dev/cons.
s1 = s2 True if the strings s1 and s2 are identical.
s1 != s2 True if the strings s1 and s2 are not identical.
s1 True if s1 is not the null string. (Deprecated.)
-n s1 True if the length of string s1 is non-zero.
-z s1 True if the length of string s1 is zero.
n1 -eq n2 True if the integers n1 and n2 are arithmetically equal. Any of the compar-
isons -ne, -gt, -ge, -lt, or -le may be used in place of -eq. The (nonstan-
dard) construct -l string, meaning the length of string, may be used in place
of an integer.
These primaries may be combined with the following operators:
! unary negation operator
-o binary or operator
-a binary and operator; higher precedence than -o
( expr ) parentheses for grouping.
The primitives -b, -u, -g, and -s return false; they are recognized for compatibility with
Notice that all the operators and flags are separate arguments to test. Notice also that
parentheses and equal signs are meaningful to rc and must be enclosed in quotes.
Test is a dubious way to check for specific character strings: it uses a process to do
what an rc(1) match or switch statement can do. The first example is not only inefficient
but wrong, because test understands the purported string "-c" as an option.
if (test $1 '=' "-c") echo OK # wrong!
A better way is
if (~ $1 -c) echo OK
Test whether is in the current directory.
test -f abc -o -d abc
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