if["$(cat myfile.txt)"="hello"];thenecho"File contains the string 'hello'."elseecho"File does not contain the string 'hello'."fi 如果文件包含字符串"hello",则脚本将打印以下内容: Filecontainsthestring'hello'. 使用正则表达式 正则表达式是一种强大的模式匹配语言,可用于在文本中搜索复杂模式。Ba...
Check If File Contains String in Bash Check If Boolean Is True in Bash Check If Output Contains String in Bash Echo Multiple Lines in Bash Return Array from Function in Bash Get Text Between Two Strings in Bash Remove Double Quotes from String in Bash Set Output of Command to Variable in ...
File contains at last on occurence of root4.一个if/then结构可以包含多级比较和tests(嵌套)if[ condition -true] then command1command2...else#可选 command3command4... fi 当if和then在一个条件测试的同一行时,必须用";"来终止if表达式(因为:if和then都是关键字) 例如:if[ -x"$filename"] ; the...
[student@studentvm1 testdir]$ File="TestFile1";touch$File;if[-s$File] ;thenecho"$Fileexists and contains data.";elseecho"$Filedoes not exist or is empty.";fiTestFile1 does not exist or is empty. 向文件添加一些内容,然后再测试一次: [student@studentvm1 testdir]$ File="TestFile1";ec...
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...
Using the “If -Z” Statement Sometimes, it is required to check if a string variable is empty or if it contains a string of zero length. There are many options in Bash to do this task. Using the “-z” option with the “if” statement is one of the ways to check whether a vari...
#Declare string S2 S2="Bash" if [ $S1 = $S2 ]; then echo "Both Strings are equal" else echo "Strings are NOT equal" fi 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Bash File Testing #!/bin/bash file="./file" if [ -e $file ]; then ...
if ! grep -q lookupWord "$myFile"; then echo 'Failed to grep'; fi How to use the BASH_REMATCH variable with the Regular Expression Operator =~? The Regular Expression conditional operator =~ takes a string value on the left side and a Bash extended regular expression on the right si...
#!/bin/bash # 遍历指定目录下的所有文件 for file in /path/to/directory/*; do # 判断文件是否为空 if [ -s "$file" ]; then echo "$file 不为空" else echo "$file 为空" fi done 这个脚本使用了一个for循环来遍历指定目录下的所有文件。对于每个文件,使用-s选项来判断文件是否为空。如果文...
Exercise 3: Enhance the previous script by checking if the given file is regular file, a directory or a link or if it doesn't exist. Hint: Use -f, -d and -L Exercise 4: Write a script that accepts two string arguments. The script should check if the first string contains the secon...