bash 关系运算符_Bash比较运算符

bash 关系运算符

What are all the bash supported comparison operators?

bash支持的比较运算符是什么？

The man 1 test contains all the operators supported in bash.

man 1测试包含bash支持的所有运算符。

An omitted EXPRESSION defaults to false. Otherwise, EXPRESSION is true or false and sets exit status. It is one of:

省略的EXPRESSION默认为false。 否则，EXPRESSION为true或false，并设置退出状态。 它是以下之一：

( 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
-nSTRING
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.

注意：[[使用–help和–version选项，但不支持。 测试对待所有其他非空STRING的方式相同。

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.

注意：您的外壳可能具有自己的test和/或[版本，通常会取代此处描述的版本。 请参阅您的Shell文档以获取有关其支持的选项的详细信息。

Answered by Eric Z Ma.

埃里克·马（Eric Z Ma）回答。

翻译自: https://www.systutorials.com/bash-comparison-operators/

bash 关系运算符