TEST.1
上传用户:jnzhq888
上传日期:2007-01-18
资源大小:51694k
文件大小:1k
- .TH TEST 1
- .SH NAME
- test, [ - test for a condition
- .SH SYNOPSIS
- fBtest fIexprfR
- .br
- fB[ fIexpr fB]fR
- .br
- .de FL
- .TP
- \fB\$1\fR
- \$2
- ..
- .de EX
- .TP 20
- \fB\$1\fR
- # \$2
- ..
- .SH OPTIONS
- (none)
- .SH EXAMPLES
- .EX "test -r file" "See if file is readable"
- .SH DESCRIPTION
- .PP
- fITestfR 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
- .sp
- .nf
- .ta 0.5i 1.5i
- -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 not a directory
- -d file true if the file is a directory
- -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
- .fi
- The operators fB-gtfR, fB-gefR, fB-nefR, fB-lefR, and
- fB-ltfR may be used as well.
- These operands may be combined with fB-afR (Boolean and),
- fB-ofR (Boolean or), !
- (negation).
- The priority of fB-afR is higher than that of fB-ofR.
- Parentheses are permitted, but must be escaped to keep the shell from trying
- to interpret them.
- .SH "SEE ALSO"
- .BR expr (1),
- .BR sh (1).