bash - GNU Bourne-Again Shell
gawk - Pattern Scanning and Processing Language
sed - a Stream Editor
perl - Practical Extraction and Report Language
perl : powerful like ksh, fast, use widely
awk : basic using in shell script, also write awk script
bash : provide user interface, also provide some command
sed : line editor, oriented lines
perl 是一种很强的编程语言,你几乎可以用它做任何事情,awk 则简单多了,主要用来处理具有一定格式的文件。如果是 shell 编程,awk、sed 等都是不可缺少的工具,当然 perl 完全可以替代 awk、sed、grep 等命令.
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