[問題] linux help 如何解讀

[gecer (gecer)]

如下範例 小弟 當閱讀指令說明時 如何理解對應順序?例如下面指令 switches 對應的是

那些範圍?


Usage: /home/linux/myperl/bin/perl [switches] [--] [programfile] [arguments]
  -0[octal]         specify record separator (\0, if no argument)
  -a                autosplit mode with -n or -p (splits $_ into @F)
  -C[number/list]   enables the listed Unicode features
  -c                check syntax only (runs BEGIN and CHECK blocks)
  -d[:debugger]     run program under debugger
  -D[number/list]   set debugging flags (argument is a bit mask or alphabets)
  -e program        one line of program (several -e's allowed, omit
programfile)
  -E program        like -e, but enables all optional features
  -f                don't do $sitelib/sitecustomize.pl at startup
  -F/pattern/       split() pattern for -a switch (//'s are optional)
  -i[extension]     edit <> files in place (makes backup if extension
supplied)
  -Idirectory       specify @INC/#include directory (several -I's allowed)
  -l[octal]         enable line ending processing, specifies line terminator
  -[mM][-]module    execute "use/no module..." before executing program
  -n                assume "while (<>) { ... }" loop around program
  -p                assume loop like -n but print line also, like sed
  -s                enable rudimentary parsing for switches after programfile
  -S                look for programfile using PATH environment variable
  -t                enable tainting warnings
  -T                enable tainting checks
  -u                dump core after parsing program
  -U                allow unsafe operations
  -v                print version, patchlevel and license
  -V[:variable]     print configuration summary (or a single Config.pm
variable)
  -w                enable many useful warnings
  -W                enable all warnings
  -x[directory]     ignore text before #!perl line (optionally cd to
directory)
  -X                disable all warnings

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推 Vdragon: 下面那些都是，arguments 是喂給 programfile 的。--是用
→ Vdragon: 來區分名字跟 switch 一樣的 programfile
你的意思是下面那些指令都是switches? perl -e programfile arguments?
※ 編輯: gecer (111.255.12.55), 03/31/2018 23:07:36
→ MOONRAKER: 不然咧
→ MOONRAKER: 找一些簡單的指令來看 何必沒事看perl 看到會破
推 Neisseria: perl 從看參數到能下有用的指令會有一些距離 XD
→ Neisseria: 可先看 grep 之類的，比較親民
→ wilson6405: man man開始