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。
_repeat() { #@ USAGE: _repeat string number _REPEAT=$1 while (( ${#_REPEAT} < $2 )) ## Loop until string exceeds desired length do _REPEAT=$_REPEAT$_REPEAT$_REPEAT ## 3 seems to be the optimum number done _REPEAT=${_REPEAT:0:$2} ## Trim to desired length } repeat() { ...
@查尔斯达菲,你说得对。似乎我不理解tldp.orgstringZ=abcABC123ABCabc; echo ${stringZ:-4} Defaults to full string, as in ${parameter:-default}上的例子。bash语法很误导人,${3: -1}和${3:-1}之间只有一个空格,我得到了两个不同的东西… @Piotrekkr,我强烈推荐使用bash hacker参考(wiki.bash hack...
After deletion of shortest match from front: string.txt After deletion of shortest match from back: bash.string In the first echo statement substring ‘*.’ matches the characters and a dot, and # strips from the front of the string, so it strips the substring “bash.” from the variable...
, the *: pattern matched everything up to the last colon, and the ## operator is used to remove all of it, leaving only the last element of the string you?. You can replace the colon(:) with any character that we want to match. Let"s see another example where you want to get ...
the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value HHHHHHHH (one to eight hex digits) \cx a control-x character The expanded result is single-quoted, as if the dollar sign had not been present. A double-quoted string preceded by a dollar sign ($"string") will ...
Trim all white-space from string and truncate spacesThis is an alternative to sed, awk, perl and other tools. The function below works by abusing word splitting to create a new string without leading/trailing white-space and with truncated spaces....
OPTIONS In addition to the single-character shell options documented in the description of the set builtin command, bash inter- prets the following options when it is invoked: -c string If the -c option is present, then commands are read from string. If there are arguments after the string...
In bash, there are several ways to truncate a string, including by character count, specified length, or from the beginning of the string. The syntax for truncating a string variable in bash is as follows: ${<string-name>:<starting-position>:<length>} ...
m*: Support completing arg of last bundled short option (8f82fd9) mysqladmin: Reuse --default-character-set completion from mysql (b984e6a) mysql, mysqladmin: Complete --ssl-{ca,cert,key} option arg (d5ee055) modinfo: Fall back to _parse_usage if _parse_help yields no results (d2...