路径测试
[root@localhost test]# test -d /home
[root@localhost test]# echo $?
0
[root@localhost test]# test -d /hoem
[root@localhost test]# echo $?
1[root@localhost test]# cat mysql_backup_test
#!/usr/bin/bash
back_dir=/var/mysql_back
if ! test -d $back_dir; then
mkdir -p $back_dir
fi
echo "MySQL Backup Ongoing..."
[root@localhost test]# chmod a+x mysql_backup_test
[root@localhost test]# ./mysql_backup_test
MySQL Backup Ongoing...debug执行
[root@localhost test]# bash -vx mysql_backup_test
#!/usr/bin/bash
back_dir=/var/mysql_back
+ back_dir=/var/mysql_back
if ! test -d $back_dir; then
mkdir -p $back_dir
fi
+ test -d /var/mysql_back
echo "MySQL Backup Ongoing..."
+ echo 'MySQL Backup Ongoing...'
MySQL Backup Ongoing...
[root@localhost test]#如果没有root权限，就给出提示，并退出。
[root@localhost test]# cat httpd_install.sh
#!/usr/bin/bash
if [ $UID -ne 0 ];then
echo "You are not root,root required"
exit
fi
yum -y install httpd
[root@localhost test]# chmod a+x httpd_install.sh
[root@localhost test]# ./httpd_install.sh
Loaded plugins: fastestmirror
[root@localhost test]# ./httpd_install.sh
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not get metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=x86_64 error was
12: Timeout on https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=x86_64: (28, 'Operation timed out after 30004 milliseconds with 0 out of 0 bytes received')
* base: mirrors.ustc.edu.cn
* epel: mirror.poliwangi.ac.id
* extras: mirrors.cn99.com
* updates: mirrors.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.4.6-90.el7.centos will be installed
--> Processing Dependency: httpd-tools = 2.4.6-90.el7.centos for package: httpd-2.4.6-90.el7.centos.x86_64
--> Processing Dependency: /etc/mime.types for package: httpd-2.4.6-90.el7.centos.x86_64
--> Running transaction check
---> Package httpd-tools.x86_64 0:2.4.6-90.el7.centos will be installed
---> Package mailcap.noarch 0:2.1.41-2.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================================================================================================================================================================================================================
Package Arch Version Repository Size
=============================================================================================================================================================================================================================================================================
Installing:
httpd x86_64 2.4.6-90.el7.centos base 2.7 M
Installing for dependencies:
httpd-tools x86_64 2.4.6-90.el7.centos base 91 k
mailcap noarch 2.1.41-2.el7 base 31 k
Transaction Summary
=============================================================================================================================================================================================================================================================================
Install 1 Package (+2 Dependent packages)
Total download size: 2.8 M
Installed size: 9.6 M
Downloading packages:
(1/3): mailcap-2.1.41-2.el7.noarch.rpm | 31 kB 00:00:01
(2/3): httpd-tools-2.4.6-90.el7.centos.x86_64.rpm | 91 kB 00:00:01
(3/3): httpd-2.4.6-90.el7.centos.x86_64.rpm | 2.7 MB 00:00:07
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 388 kB/s | 2.8 MB 00:00:07
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : httpd-tools-2.4.6-90.el7.centos.x86_64 1/3
Installing : mailcap-2.1.41-2.el7.noarch 2/3
Installing : httpd-2.4.6-90.el7.centos.x86_64 3/3
Verifying : mailcap-2.1.41-2.el7.noarch 1/3
Verifying : httpd-tools-2.4.6-90.el7.centos.x86_64 2/3
Verifying : httpd-2.4.6-90.el7.centos.x86_64 3/3
Installed:
httpd.x86_64 0:2.4.6-90.el7.centos
Dependency Installed:
httpd-tools.x86_64 0:2.4.6-90.el7.centos mailcap.noarch 0:2.1.41-2.el7
Complete!测试条件
[root@localhost test]# man test
TEST(1) User Commands TEST(1)
NAME
test - check file types and compare values
SYNOPSIS
test EXPRESSION
test
[ EXPRESSION ]
[ ]
[ OPTION
DESCRIPTION
Exit with the status determined by EXPRESSION.
--help display this help and exit
--version
output version information and exit
An omitted EXPRESSION defaults to false. Otherwise, EXPRESSION is true or false and sets exit status. It is one of:
( EXPRESSION )
EXPRESSION is true
! EXPRESSION
EXPRESSION is false
EXPRESSION1 -a EXPRESSION2
both EXPRESSION1 and EXPRESSION2 are true
EXPRESSION1 -o EXPRESSION2
either EXPRESSION1 or EXPRESSION2 is true
-n STRING
the length of STRING is nonzero
STRING equivalent to -n STRING
-z STRING
the length of STRING is zero
STRING1 = STRING2
the strings are equal
STRING1 != STRING2
the strings are not equal
INTEGER1 -eq INTEGER2
INTEGER1 is equal to INTEGER2
INTEGER1 -ge INTEGER2
INTEGER1 is greater than or equal to INTEGER2
INTEGER1 -gt INTEGER2
INTEGER1 is greater than INTEGER2
INTEGER1 -le INTEGER2
INTEGER1 is less than or equal to INTEGER2
INTEGER1 -lt INTEGER2
INTEGER1 is less than INTEGER2
INTEGER1 -ne INTEGER2
INTEGER1 is not equal to INTEGER2
FILE1 -ef FILE2
FILE1 and FILE2 have the same device and inode numbers
FILE1 -nt FILE2
FILE1 is newer (modification date) than FILE2
FILE1 -ot FILE2
FILE1 is older than FILE2
-b FILE
FILE exists and is block special
-c FILE
FILE exists and is character special
-d FILE
FILE exists and is a directory
-e FILE
FILE exists
-f FILE
FILE exists and is a regular file
-g FILE
FILE exists and is set-group-ID
-G FILE
FILE exists and is owned by the effective group ID
-h FILE
FILE exists and is a symbolic link (same as -L)
-k FILE
FILE exists and has its sticky bit set
-L FILE
FILE exists and is a symbolic link (same as -h)
-O FILE
FILE exists and is owned by the effective user ID
-p FILE
FILE exists and is a named pipe
-r FILE
FILE exists and read permission is granted
-s FILE
FILE exists and has a size greater than zero
-S FILE
FILE exists and is a socket
-t FD file descriptor FD is opened on a terminal
-u FILE
FILE exists and its set-user-ID bit is set
-w FILE
FILE exists and write permission is granted
-x FILE
FILE exists and execute (or search) permission is granted
Except for -h and -L, all FILE-related tests dereference symbolic links. Beware that parentheses need to be escaped (e.g., by backslashes) for shells. INTEGER may also be -l STRING, which evaluates to the length of STRING.
NOTE: [ honors the --help and --version options, but test does not. test treats each of those as it treats any other nonempty STRING.
NOTE: your shell may have its own version of test and/or [, which usually supersedes the version described here. Please refer to your shell's documentation for details about the options it supports.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report test translation bugs to <http://translationproject.org/team/>
AUTHOR
Written by Kevin Braunsdorf and Matthew Bradburn.
COPYRIGHT
Copyright ? 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for test is maintained as a Texinfo manual. If the info and test programs are properly installed at your site, the command
info coreutils 'test invocation'
