This guide presented the Bash pattern matching and the various examples to ensure that you understand how to work with the various pattern matching options. Using this foundation, you can advance your Bash pattern matching and use the same logic when you want to match the various patterns on th...
-e "pattern1" -e "pattern2": This part of the command specifies multiple patterns to search for. The -e option allows specifying multiple patterns. "pattern1" and "pattern2": These are the patterns to search for. In this case, the command searches for lines containing either "pattern1"...
Example 3 - Pattern matching in case statement Pattern matchingcan be used in case statements. I am using the same example from the previous section but adding an extra pattern(20[2-9][2-9])where if the user enters any year above 2021 it will print a message saying "series yet to hap...
entry="${entry#*${token}}" #If the pattern matches the end of the variable’s value, delete the longest part that matches andreturnthe rest. result="${entry%%[ ,]*} ${result}" entry="${entry#* }" done echo"${result}" } #examples ${variable#pattern} If the pattern matches the...
Bash 编程高级教程(全) 原文:Pro Bash Programming 协议:CC BY-NC-SA 4.0 一、你好世界:你的第一个 Shell 程序 一个 shell 脚本是一个包含一个或多个您可以在命令行上输入的命令的文件。本章描述了如何创建这样的文件并使其可执行。它还涵盖了围绕 she
Executed command status. If a command matches the input variable to a pattern, the exit status of the executed command is returned. Note:If you are new to Bash, read our tutorial onBash functions. Bash case Statement Examples The sections below show practical examples of using the Bashcasesta...
Case statements are particularly useful when dealing with pattern matching or regular expressions. To demonstrate, take a look at the followingchar.shbash script: #!/bin/bash CHAR=$1 case $CHAR in [a-z]) echo "Small Alphabet." ;;
To make this fact explicit, we’ll use read-only variables in examples. So, let’s remove an extension from a filename. To do this, we need to match from the end of the string using the percent (%) operator. The singular operator will match the shortest substring, double will match ...
Three types of loops are used in bash for various purposes. These are for, while and until loops. The different uses of these loops are explained by using 30 different examples in this article. Uses of Bash loops: Using for loop to read items in a list ...
!(patternlist) Matches anything except one of the given patterns. Some examples of these include: *(alice|hatter|hare) would match zero or more occurrences of alice, hatter, and hare. So it would match the null string, alice, alicehatter, etc. +(alice|hatter|hare) would do the same ...