search:linux shell if test相關網頁資料

- linuxacademy.com
  
  Conditions in bash scripting (if statements) | Linux Academy Blog
  
  25 Nov 2012 ... A small amount of general shell knowledge is assumed. ... A short explanation of the example: first we check if the file somefile is readable (“if ...
  
  2025-04-27
  
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- darrenshen2008.blogspot.com
  
  Darren Shen 的 Genero 4GL /TIPTOP / Linux shell 程式備忘
  
  為何要升級? 因為Genero 的開發程式持續增加新的功能(例如: HTML5)，如果開發工具無法升級，也就是說，這套ERP 就無法使用開發工具提供的新功能，換句話說，就是等著汰換。公司花了很多的人力物力來開發客製 ERP 目的就是希望公司的作業流程跟 ERP 緊密 ...
  
  2025-04-23
  
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Introduction to if

日期：2025-04-26

The TEST-COMMAND list is executed, and if its return status is zero, the ... More information about this subject can be found in the Bash documentation. ... valid UNIX command, any executable program, any executable shell script or any shell ......

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Linux / UNIX: Check If File Is Empty Or Not Using Shell Script

日期：2025-04-26

Linux check if file empty or not - a sample shell command and script to check that file is empty or has data in it under bash / ksh / sh UNIX / Linux / OS X shell....

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UNIX and Linux Shell Script Test Command - IT For Everyone!

日期：2025-04-28

test returns true in the following cases: test s s is not a null string test -n string string is nonzero test sting1 = string2 the two strings are equal test sting1 != string2 the two strings are not equal test integer1 -eq integer2 the integers are equal...

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Testing if a variable is empty in a shell script - Unix & Linux Stack Exchange

日期：2025-04-26

I have seen the following technique used many times on many different shells, to test if a variable is empty: if [ "x$1" = "x" ]; then # Variable is empty fi Are there any advantages ......

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BASH Shell: Test If a File Is Writable or Not

日期：2025-04-30

Explains how to find out if a FILE exists and write permission is granted under UNIX / Linux / BSD bash shell scripting. ... ©2000-2014 nixCraft. All rights reserved. Privacy Policy - Terms of Service - Questions or Comments - We are proudly powered by Li...

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Linux shell編程——if條件判斷 - wokaotesting - 博客頻道 - CSDN.NET

日期：2025-04-30

[macg@mac-home ~]$ vi test.sh: echo "input the num:" read num echo "input is $num" if [ -z "$JHHOME" -a -d $HOME/$num ] 如果變數$JHHOME為空，且$HOME/$num目錄存在 then JHHOME=$HOME/$num 則賦值 fi echo "JHHOME is ......

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Test Constructs

日期：2025-04-28

An if can test any command, not just conditions enclosed within brackets. .... Therefore, in a Bash script, test does not call the external /usr/bin/test binary, which is part of the sh-utils package. Likewise ......

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