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echo "You Pick up Unix (Sun Os)" else ### nested if i.e. if within if ### if [ $osch -eq 2 ] ; then echo "You Pick up Linux (Red Hat)" else echo "What you don't like Unix/Linux OS." fi fi Run the above shell script as follows: $ chmod +x nestedif.sh $ ./nes...
以下是一个简单的Shell脚本示例,用于检查一个文件是否存在,并根据检查结果执行不同的操作: 代码语言:txt 复制 #!/bin/bash FILE="/path/to/file" if [ -f "$FILE" ]; then echo "文件存在" else echo "文件不存在" fi 参考链接 Linux Shell Scripting If...Else Bash If...Else Statement 常见问题及...
8. Shell Programming and Scripting if-else construct not working Hi all, Sorry to ask this easy question but I am stuck. In a scenario i am executing one shell script which contains a if - else construct : if ; then echo $line $line >> successful_build.txt else $line >> failed...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article...
3. Shell Programming and Scripting Condition checking in UNIX i have a script where i have to find the age of a file, if then echo "dnb file is present for the monthly load" >> $RUNLOG dnb="1" else echo "dnb file has not arrived yet" > $ERRLOG dnb="0" fi i know the fi...
Bash脚本是一种在Linux和Unix系统中常用的脚本语言,用于自动化任务和批处理。IF语句是Bash脚本中的条件语句,用于根据条件的真假来执行不同的操作。 当Bash脚本中的IF语句不起作用时,可能有以下几个可能的原因和解决方法: 语法错误:检查IF语句的语法是否正确,包括条件表达式的书写和语句块的缩进。IF语句的基本语法是:...
/bin/kshgrep$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...
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概述:你有没有为Bash中太多的测试和比较选项而困惑呢?这则技巧可以帮助你深刻理解多种文件类型、数值和字符串的测试,这样你便会知道什么时候需要用test、[ ]、[[ ]]、(( ))或者是if-then-else结构。 现在,许多 Linux® 和 UNIX® 都有Bash 环境,它往往还是Linux默认的shell环境。Bash拥有强大的程序设计能...