#!/bin/bash var="" substring="world" if [ -z "$var" ]; then echo "变量为空" else if [[ $var == *"$substring"* ]]; then echo "部分匹配成功" else echo "部分匹配失败" fi fi 通过这些方法和示例代码,你可以有效地在 Bash 脚本中检查变量是否包含特定的文本字符串,并解决常见的相关问题...
另请参见:Bash String Comparison: Find Out IF a Variable Contains a Substring
它会扩展成 值中以 为开始,长为 个字符的字符串。...它的使用方法为: 借助 cut 命令 可以使用 命令来将文件中每一行或者变量中的一部分删掉。...它的语法为: 想了解更多请阅读 bash 的 man 页: 另请参见:Bash String Comparison: Find Out IF a Variable Contains a Substring...
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
# Define the target stringstring="This is a test string."# Check if the string contains the substring "test"if[["$string"== *"test"* ]]thenecho"Substring found."elseecho"Substring not found."fi As expected, theifstatement will return"Substring found."as the target string$stringcontains...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
echo $subscriptionId # Returns the contents of the variable. az account list --query "[? contains(name, 'Test')].id" -o tsv # Returns the subscription id of a non-default subscription containing the substring 'Test' subscriptionId="$(az account list --query "[? contains(name, 'Test'...
1 : This is a comment thar generates an error,(if [ $x -eq 3] ). ":"还用来在/etc/passwd和$PATH变量中用来做分隔符. bash$ echo $PATH /usr/local/bin:/bin:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/games! 取反操作符,将反转"退出状态"结果,(见Example 6-2).也会反转test操作符的意义...
Basically, you are checking if the full string matches xxxxsubstrxxxx type of pattern. You could also use the substring directly instead of using it through a variable like this: avimanyu@linuxhandbook:~$ if [[ $fullstring == *"stretch"* ]]; then ...
# of the LINENO environment variable. It contains the current # line number. echo"Example of error with line number and message" error_exit"$LINENO: An error has occurred." 在bash脚本中有更好的错误处理例程吗? 相关讨论 请参阅这个详细的答案:在bash脚本中引发错误。