数值比较 -eq:equal,是否相等。 [root@c7-server ~]# age=28[root@c7-server ~]# [ $age -eq28] [root@c7-server ~]#echo$?0 -ne:not equal,是否不相等。 [root@c7-server ~]# [ $age -ne28] [root@c7-server ~]#echo$?1 -gt:greater than,是否大于。 [root@c7-server ~]# [ $age...
echo "Number does not equal 1" fi set +x上面的例子中,只对特定的代码段打开命令输出。Bash 的错误处理如果脚本里面有运行失败的命令(返回值非0),Bash 默认会继续执行后面的命令。#!/usr/bin/env bash foo echo bar上面脚本中,foo是一个不存在的命令,执行时会报错。但是,Bash 会忽略这个错误,继续往下执行...
str1="Hello" str2="World" if [ "$str1" == "$str2" ]; then echo "Strings are equal" else echo "Strings are not equal" fi 字符串不相等比较:使用叹号加双等号(!=)来比较两个字符串是否不相等。例如: 代码语言:txt 复制 str1="Hello" str2="World" if [ "$str1" != "$str2" ]...
= "$string2" ]; then echo "string1 and string2 are not equal." else echo "string1 and string2 are equal." fi 如果不使用引号,Bash会将hello world视为两个独立的参数hello和world,导致比较结果错误。 5. 潜在陷阱和常见问题 转义字符:在字符串比较中,特别是使用<、>等符号时,需要注意...
如果您更改任何字符串,您将得到Not equal,您可以在这里尝试。 bash中一个字符串中的多个正则表达式匹配 有关纯bash解决方案,请参见以下示例。 Example script: # cat foo.shshopt -s extglobvar='[12 chapters][13 chapters][14 chapters]'while [[ $var =~ ([0-9]+ chapters) ]]; do echo "${...
is equal to != is not equal to < less than <= is less than or equal to > greater than >= is greater than or equal to -z string is null -n string is not null Regular Expressions Regular expressions are shortened as ‘regexp' or ‘regex'. They are strings of characters that defin...
The first condition is false since 5 is not equal to 4, but then the next condition in the ELIF statement is true since 5 is greater than 3, so that echo command is executed and the rest of the statement is skipped. Try to guess what will happen if we use2as an argument: ...
If the shell is started with the effective user (group) id not equal to the real user (group) id, and the -p option is not supplied, no startup files are read, shell functions are not inherited from the environment, the SHELLOPTS, BASHOPTS, CDPATH, and GLOBIGNORE variables, if they...
_longopt: pick first long option on a line, not last (54abb2e) _longopt: simplify regex, use printf instead of echo, drop unnecessary sort (c1ec2e1) test: add some _longopt unit tests (6fdb0e2) test: include test_unit_longopt.py in dist (4a73043) modprobe: append = to module ...
String1 and String2 are equal. String1 and String3 are not equal. 这里,如果我们先用 = 运算符比较 String1 和 String2。由于 String1 和 String2 都具有相同的长度,具有相同的字符序列,比较运算符返回 true,因此我们得到 String1 and String2 are equal.. 作为程序中第一个 if-else 块的输出。 同样...