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 1.8K90 如何在 Bash Shell ...
Checking for substring in bash using if else statement If you are familiar with theconditional statements in bash, you can use it to check if a string contains the substring in the following manner: if [[ $fullstring == *"$substr"* ]]; Simple example for checking substring The double br...
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...
One of the most common operations when working with strings in Bash is to determine whether or not a string contains another string. In this article, we will show you several ways to check if a string contains a substring.
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'...
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 1.7K90 如何在 Bash Shell ...
/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# (...
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 $PATH /usr/local/bin:/bin:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/games! 取反操作符,将反转"退出状态"结果,(见Example 6-2).也会反转test操作符的意义...
# of the LINENO environment variable. It contains the current # line number. echo"Example of error with line number and message" error_exit"$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。
if [[ "$variable" == *subString* ]] #this returns true if the provided substring is in the variable if [[ "$variable" != *subString* ]] #this returns true if the provided substring is not in the variable if [[ "$variable" == subString* ]] #this returns true if the variable ...