GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v7 |
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test(1) |
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test − condition command
test expr
test evaluates the expression expr, and if its value is true then returns zero exit status; otherwise, a non zero exit status is returned. test returns a non zero exit if there are no arguments.
The following primitives are used to construct expr.
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−r file |
true if the file exists and is readable. | ||
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−w file |
true if the file exists and is writable. | ||
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−f file |
true if the file exists and is not a directory. | ||
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−d file |
true if the file exists and is a directory. | ||
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−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 associated with a terminal device.
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−z s1 |
true if the length of string s1 is zero. |
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−n s1 |
true if the length of the string s1 is nonzero. |
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s1 = s2 |
true if the strings s1 and s2 are equal. |
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s1 != s2 |
true if the strings s1 and s2 are not equal. |
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s1 |
true if s1 is not the null string. |
n1 −eq n2
true if the integers n1 and n2 are algebraically equal. Any of the comparisons −ne, −gt, −ge, −lt, or −le may be used in place of −eq.
These primaries may be combined with the following operators:
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! |
unary negation operator |
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−a |
binary and operator |
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−o |
binary or operator |
( expr )
parentheses for grouping.
−a has higher precedence than −o. Notice that all the operators and flags are separate arguments to test. Notice also that parentheses are meaningful to the Shell and must be escaped.
sh(1), find(1)
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test(1) | |