How to check if a command succeeds or failed? How to do string comparison and check if a string equals to a value? How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if statement? (if not command or if not ...
/bin/kshgrep$NAME filenameif[ $? -eq0]echo"Name Found"elseecho"Name not Found"fi The $? holds the exit status of the previously executed command. Check the man page please. 来源:https://www.unix.com/shell-programming-and-scripting/30996-using-grep-if-statement.html 虽然上面是针对是ksh...
line done 使用while循环 while read -r line do echo $line done < filename While循环中read命令从标准输入中读取一行,并将内容保存到变量...line中。...在这里,-r选项保证读入的内容是原始的内容,意味着反斜杠转义的行为不会发生。输入重定向...
grep #!/bin/kshgrep$NAME filenameif[ $? -eq0]echo"Name Found"elseecho"Name not Found"fi 1. 2. 3. 4. 5. 6. 7. The $? holds the exit status of the previously executed command. Check the man page please. 来源:https:///shell-programming-and-scripting/30996-using-grep-if-stateme...
if [ $count -eq 100 ] then echo "Count is 100" else echo "Count is not 100" fi Note:This article is part of the ongoingBash Tutorialseries. 3. Bash If..elif..else..fi If [ conditional expression1 ] then statement1 statement2 ...
另外,正如@forvaidya之前提到的,您可以简单地列出所需的标签和grep: 123456 if GIT_DIR=/path/to/repo/.git git show-ref --tags | egrep -q"refs/tags/$1$" then echo"Found tag" else echo"Tag not found" fi 您也可以使用git tag --list代替git show-ref --tags: 123456 if GIT_DIR=/path...
No match found In the above example, grep searched for the pattern pattern in the file dummy.txt. Here, the -c option counts the number of matches, and the result is checked with an if statement. If the count is 0, the script outputs the message No match found to the console using...
awk '{print $2}' class.txt | grep '^[0-9.]' > res 字符串切片:${var:offset:length} 示例: [root@localhost ~]#mypath="/etc/sysconfig/network-scripts/"#定义一个变量,等会切这个变量 [root@localhost ~]# echo ${mypath:5}#偏移5个字符显示 ...
问Bash - if...then语句-意外的标记EN介绍 if case 等语句。 条件判断语句 字符串判断 str1 = str...
[$1-eq"shellcheck"]# Numerical comparison of strings[$n&&$m]# && in [ .. ][ grep -q foo file ]# Command without $(..)[["$$file"== *.jpg ]]# Comparisons that can't succeed(( 1 -lt 2 ))# Using test operators in ((..))[ x ] & [ y ] | [ z ]# Accidental ...