You can set theinternal field separator(IFS) variable, and then let it parse into an array. When this happens in a command, then the assignment toIFSonly takes place to that single command's environment (toread). It then parses the input according to theIFSvariable value into an array, ...
split() { local string="$1" local delimiter="$2" if [ -n "$string" ]; then local part while read -d "$delimiter" part; do echo $part done <<< "$string" echo $part fi } Run Code Online (Sandbox Code Playgroud) 例如,命令 $ split 'a;b;c' ';' Run Code Online (Sandbox...
一旦变量被导出,它将一直保留在环境中,直到被取消设置: $ unset x $ showvar $x is not set $ x=3 $ showvar $x is not set $ export x $ showvar $x = 3 $ x= ## in bash, reassignment doesn't remove a variable from the environment $ showvar $x is set but empty 注意 showvar不...
我在循环中打印它时只得到第一个字符串,没有括号围绕$IN它起作用。 答案 您可以设置内部字段分隔符(IFS)变量,然后将其解析为数组。当在命令中发生这种情况时,对IFS的分配仅发生在该单个命令的环境中(要read)。然后它根据IFS变量值将输入解析为一个数组,然后我们可以迭代它。
2.3、参数和变量展开(parameter and variable expansion ) 参数和变量替换有很多高级用法,我这边就简单引入一些概念,具体详细用法,还是要查看手册。 以符号引起来的字符串,例如引起来的字符串,例如{a},a,a,{a_b}等,都表示一个变量;${STRINGS}中间STRINGS部分表示的是 参数,这部分可能会做替换的。常见形式有: ...
In this example, the last element of the string is extracted using the IFS variable, which is set to a colon character ":". Splitting the string into words tells the shell to use a : as the delimiter. Without Using the IFS variable Use space as a delimiter to split the string in ba...
shell displays the total user and system time consumed by the shell and its children. The TIMEFORMAT variable may be used to specify the format of the time information. Each command in a pipeline is executed as a separate process (i.e., in a subshell). ...
Split a string on a delimiterCAVEAT: Requires bash 4+This is an alternative to cut, awk and other tools.Example Function:split() { # Usage: split "string" "delimiter" IFS=$'\n' read -d "" -ra arr <<< "${1//$2/$'\n'}" printf '%s\n' "${arr[@]}" }...
When no array variable name is provided to the mapfile command, the input will be stored into the $MAPFILE variable. Note that the mapfile command will split by default on newlines character but will preserve it in the array values, you can remove the trailing delimiter using the -t ...
When the expansion occurs within double quotes, it expands to a single word with the value of each parameter separated by the first character of the IFS special variable. That is, "$*" is equivalent to "$1c$2c...", where c is the first character of the value of the IFS variable. ...