diff options
Diffstat (limited to 'static/unix-v10/man1/if.1')
| -rw-r--r-- | static/unix-v10/man1/if.1 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/static/unix-v10/man1/if.1 b/static/unix-v10/man1/if.1 new file mode 100644 index 00000000..917ec740 --- /dev/null +++ b/static/unix-v10/man1/if.1 @@ -0,0 +1,76 @@ +.pa 1 +.he 'IF (I)'3/15/72'IF (I)' +.ti 0 +NAME if -- conditional command +.sp +.ti 0 +SYNOPSIS if__ expr command [ arg918 ... ] +.sp +.ti 0 +DESCRIPTION if__ +evaluates the expression expr____, and if its value is true____, +executes the given command_______ with the given arguments. + +The following primitives are used to construct +the expr____: + +.in +9 +.ti -4 +-r__ file +.br +true if the file exists and is readable. + +.ti -4 +-w__ file +.br +true if the file exists and is writable + +.ti -4 +s1 =_ s2 +.br +true if the strings s1__ and s2__ are equal. + +.ti -4 +s1 !=__ s2 +.br +true if the strings s1__ and s2__ are not equal. + +.in -9 +These primaries may be combined with the +following operators: + +.in +5 +!_ +.ti +4 +unary negation operator + +-a__ +.ti +4 +binary and___ operator + +-o__ +.ti +4 +binary or__ operator + +(_ expr )_ +.ti +4 +parentheses for grouping. + +.in -5 +-a__ has higher precedence than -o__. +Notice that all the operators and flags are separate +arguments to if__ and hence must be surrounded by spaces. +.sp +.ti 0 +FILES -- +.sp +.ti 0 +SEE ALSO sh(I) +.sp +.ti 0 +DIAGNOSTICS "if error", +if the expression has the wrong syntax; +"command not found." +.sp +.ti 0 +BUGS -- |