[ 条件判断 ] 就是使用 test 命令判断,两端必须有空格 if 如果 和 then 在一行,需要加 ; 单分支 if [ 条件判断式 ];then 命令 fi 或者 if [ 条件判断式 ] then 命令 fi 双分支 if [ 条件判断式 ] then 命令 else 命令 fi 多分支 if [ 条件判断式1 ] then 命令 elif [ 条件判断式2 ] then ...
字符串判断👇👇👇[-z string]“string”的长度为零则为真[-n string]or[string]“string”的长度为非零non-zero则为真[sting1==string2]如果2个字符串相同则为真。 “=”may be used insteadof“==”forstrict posix compliance[string1!=string2]如果字符串不相等则为真[string1<string2]如果“stri...
1.1.4.检查shell选项 加入到你的Bash配置文件中去: # These lines will print a message if the noclobber option is set: if [ -o noclobber ] then echo "Your files are protected against accidental overwriting using redirection." fi 环境以上的例子将在命令行输入后开始工作: anny ~> if [ -o nocl...
9、命令||命令 if grep -q "rm" fn.sh || [ $a -lt 100 ];then
自定函数代码如下：Public Function ifzero(X)If X = 0 Then ifzero = ""Else ifzero = X End ...
[-n string] or [string] “string”的长度为非零non-zero则为真 [sting1==string2] 如果2个字符串相同。“=”may be used instead of “==”for strict posix compliance则为真 [string1!=string2] 如果字符串不相等则为真 [string1 [arg1 OP arg2] “OP”is one of –eq,-ne,-lt,-le,-gt...
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i write the songs i wrote the again i x o um a zero i yang i yÜ chao tien tui i ll forsake friends i cars bar i my me strawberry eg ill neve ll in love a im with you all the w idotm in pain i m glad you re here ive done my sentence id like to pick sea s ill wai...
If logical_test is FALSE and value_if_false is blank (that is, after value_if_true, there is a comma followed by the closing parenthesis), then the value 0 (zero) is returned. Value_if_false can be another formula. Remarks Up to seven IF functions can be nested as value_if_true ...
(that is, after value_if_true, there is no comma), then the logical value FALSE is returned. If logical_test is FALSE and value_if_false is blank (that is, after value_if_true, there is a comma followed by the closing parenthesis), then the value 0 (zero) is returned. Value_if...