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- tldp.org
  
  Introduction to if
  
  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 ...
  
  2026-04-24
  
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- nixshell.wordpress.com
  
  *nix Shell | UNIX / Linux Shell Hints and Tips (a http://steve-parker.org/sh/sh.shtml subproject)
  
  UNIX / Linux Shell Hints and Tips (a http://steve-parker.org/sh/sh.shtml subproject) ... When a Solaris server is overloaded, this is one way to check what actual memory each process is using. Here I am restricting the checks to one user (“steve”) but by
  
  2026-04-17
  
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Linux / UNIX: Check If File Is Empty Or Not Using Shell Script

日期：2026-04-24

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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Other Comparison Operators

日期：2026-04-20

Note that integer and string comparison use a different set of operators. ... String=' ' # Zero-length ("null") string variable. if [ -z "$String" ] then echo "\$String is null. ... bin/bash # str-test.sh: Testing null strings and unquoted strings, #...

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

日期：2026-04-17

[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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If / Else Statements (Shell/bash Scripting) | Sany's Linux and Open Source Blog

日期：2026-04-21

Shell scripts use fairly standard syntax for if statements. The conditional statement is executed using either the test command or the [ command ]. In its most basic form an if statement is: #!/bin/bash if [ "$1" -eq "abc" ] then echo "in if block" fi (No...

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linux下shell的if語句如何寫?-紅聯Linux系統門戶

日期：2026-04-24

紅聯Linux系統門戶為廣大linux用戶解讀：linux下shell的if語句如何寫? - - Linux發行版技術 - Fedora和Redhat資訊，下麵是詳情閱讀。 ... 在linux的bash環境下執行如下腳本test #!/bin/bash echo "Please input Quantity:" read Quantity if $Quantity -eq 100 then...

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