《How to convert a string to lower case in Bash?》 就是${parameter,,pattern}, 代码语言:javascript 代码运行次数:0 #! /bin/bash# 注意:脚本第一行一定要注明脚本解释器是bash.不能是sh,或dash # 因为sh软连接有可能指向的是dashvar="Hello,Word"# 把变量中的第一个
google上找到这个stackoverflow上的帖子,才知道Bash 4.0以上版本有更好的办法: 《How to convert a string to lower case in Bash?》 就是${parameter,,pattern},${parameter^^pattern}表达式,表达不会改变原来变量的值 #! /bin/bash # 注意:脚本第一行一定要注明脚本解释器是bash.不能是sh,或dash # 因为sh...
-help) echo "convert a file(s) to uppercase from lowercase" echo "convert a file(s) from lowercase to uppercase" echo "will convert all characters according to the" ;; echo " specified command option." echo " Where option is" echo " -l Convert to lowercase" echo " -u Convert to ...
This expansion modifies the case of alphabetic characters in parameter. The pattern is expanded to produce a pattern just as in pathname expansion. The ^ operator converts lowercase letters matching pattern to uppercase; the , operator converts matching uppercase letters to lowercase. The ^^ and ...
Write a Bash script that converts all text in a file named "temp.txt" to lowercase. Code: #!/bin/bash # Check if the file exists if [ ! -f "temp.txt" ]; then echo "Error: File 'temp.txt' not found." exit 1 fi # Convert text in "temp.txt" to lowercase and save the res...
new_string=$(echo "$input_string" | tr -dc '[:alnum:]' | tr '[:upper:]' '[:lower:]'): Removes non-alphanumeric characters and converts the string to lowercase using the "tr" command. reversed_string=$(echo "$clean_string" | rev): Reverses the new string using the "rev" com...
In Linux and Unix systems, tr is a command-line utility that translates, deletes, and squeezes characters from standard input and writes the results to standard output. The tr command can remove repeated characters, convert uppercase to lowercase, and perform basic character replacing and removin...
The ^ operator converts lowercase letters matching pattern to uppercase; the , operator converts matching uppercase letters to lowercase. The ^^ and ,, expansions convert each matched character in the expanded value; the ^ and , expansions match and con- vert only the first character in the...
/bin/bash2echo"Hit a key, then hit return."3read Keypress45case"$Keypress"in6[a-z] )echo"Lowercase letter";;7[A-Z] )echo"Uppercase letter";;8[0-9] )echo"Digit";;9* )echo"Punctuation, whitespace, or other";;10esac11exit0...
⚠️ Do not confuse -a (lowercase) with -A (uppercase). It would silently fail. Indeed, declaring an Indexed array will accept subscript but will ignore it and treat the rest of your declaration as an Indexed Array, not an Associative Array. ...