$ ./check_substr.sh "This is a test string" "test string" "This is a test string" contains "test string" $ ./check_substr.sh "This is a test string" "is a test" "This is a test string" contains "is a test" $ ./check_substr.sh "This is a test string" "isa test" "This...
例如:if[ -n $string1 ] #string1未被初始化 then echo"String /"string1/"is not null."elseecho"String /"string1/"is null"fi #结果显示string1为非空,错误if[ -n"$string1"] #string1仍然未被初始化 then echo"String /"string1/"is not null"elseecho"String /"string1/"is null"fi #结...
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.
搜索字符串是第一个参数，其余的是数组元素：containsElement () { local e match="$1" ...
TestFile1 does not exist or is empty. 现在创建一个空文件用来测试: [student@studentvm1 testdir]$ File="TestFile1" ; touch $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; else echo "$File does not exist or is empty." ; fi ...
I pretty much automated every possible task using Bash shell scripting. Based on my Bash experience, I’ve written Bash 101 Hacks eBook that contains 101 practical examples on both Bash command line and shell scripting. If you’ve been thinking about mastering Bash, do yourself a favor and re...
bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if aiming for compatibility.CAVEAT: This example only prints the first matching group. When using multiple capture groups some modification is needed....
4.2 Searching with case-insensitive string 5. Using awk 6. Using sed with grep Command 7. Conclusion 1. Overview In this article, we will see how to check if output contains String in Bash using grep, Conditional Expressions, awk, sed commands with various options. 2. Introduction to Proble...
/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# (...
if test condition-true结构与if [ condition-true ]完全相同. 就像我们前面所看到的,左中括号是调用test命令的标识,而关闭条件判断用的的右中括号在if/test结构中并不是严格必需的,但是在Bash的新版本中必须要求使用。 注意:test命令在Bash中是内建命令,用来测试文件类型,或者用来比较字符串。因此,在Bash脚本中,...