but any character or string can be used), and the-foption followed by a number to specify which field should be returned – that’s the position of the item you wish to get from the split string.
在上述代码中,首先将原始字符串和子串都转换为小写,然后使用${string%%substring}的语法来删除尾随子串。${string%%substring}表示从字符串的末尾开始,删除最长匹配的子串。 运行以上脚本,输出结果为Hello,即删除了尾随子串"world"。 对于Bash脚本的更多详细信息,可以参考腾讯云的产品文档:Bash脚本。
#!/bin/bash #: Description : print formatted sales report ## Build a long string of equals signs divider=== divider=$divider$divider ## Format strings for printf header="\n %-10s %11s %8s %10s\n" format=" %-10s %11.2f %8d %10.2f\n" ## Width of divider totalwidth=44 ## Pri...
${variable/pattern/string}:将第一个匹配更换为string,如果string为null,则删除。如果variable是@或者*,则根据命令所得的参数为单元来执行。 ${variable//pattern/string}:将所有匹配更换为string,如果string为null,则删除。如果variable是@或者*,则根据命令所得的参数为单元来执行。 最大或者最小批评只有在含有通配...
Use regex on a stringThe result of bash's regex matching can be used to replace sed for a large number of use-cases.CAVEAT: This is one of the few platform dependent bash features. bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if...
The last element in the string is effectively extracted by replacing everything before the last space character with nothing. Using basename Command Use the basename command to split the string and get the last element in Bash. Use basename Command 1 2 3 4 5 6 #!/bin/bash path="/path...
split 把文件切割成多个零碎的部分 1.2、详细解析 1.2.1、ls 语法结构:ls [OPTION]… [FILE]… 其中OPTION表示选项,可以省略不用。FILE表示查看的文件,也可以省略,可以多个。这里 的文件表示的是广义的文件,可以是文本文件,目录文件或者其他特殊文件等。 常见选项以及含义: -a, --all:隐藏文件也会被列举出来 ...
field splitting rules; sh splits all words on IFS sh does not allow MAILCHECK to be unset (?) sh does not allow traps on SIGALRM or SIGCHLD bash allows multiple option arguments when invoked (e.g. -x -v); sh allows only a single option argument (`sh -x -v' attempts ...
$ split "hello---world---my---name---is---john" "---" hello world my name is johnChange a string to lowercaseCAVEAT: Requires bash 4+Example Function:lower() { # Usage: lower "string" printf '%s\n' "${1,,}" }Example Usage:$...
Thetrcommand is different from the last two approaches; it neither replaces the first occurrence of a character in a given string nor replaces an entire word with another word.This is becausetrworks on a character-by-character basis.So, for example, we can replace the following using thetr...