csh,tcsh,bash,sh等shell的区别

csh,tcsh,bash,sh等等shell的区别的区别

主要介绍了linux下csh, tcsh,bash, sh等shell的区别？,需要的朋友可以参考下

出自bash的faq，仔细看看。顺便翻译学习一下。

复制代码 代码如下:

Section C: Differences from other Unix shells

C：跟其他UNIX shells脚本的区别

C1) How does bash differ from sh, the Bourne shell?

C1） bash和 sh、Bourne shell的区别

long invocation options

长选项的调用

[+-]O invocation option

-l invocation option

`!' reserved word to invert pipeline return value

！叹号保留字对管道返回的值取反

`time' reserved word to time pipelines and shell builtins

time保留字测试管道或内建命令耗时情况

the `function' reserved word

the `select' compound command and reserved word

$(...) 命令替代用法

the $(<filename) form of command substitution, equivalent to

$(cat filename)

$(<filename)形式的命令的替换，相当于$(cat filename)

the ${#param} parameter value length operator

${#param} 测试参数param的值的长度

the ${!param} indirect parameter expansion operator

${!param} 间接参数扩展操作

the ${!param*} prefix expansion operator

${!param*} 前缀扩展操作

expansion of positional parameters beyond $9 with ${num}

扩展了为止参数超过9的限制

variables: BASH, BASH_VERSION, BASH_VERSINFO, UID, EUID, REPLY,

TIMEFORMAT, PPID, PWD, OLDPWD, SHLVL, RANDOM, SECONDS,

LINENO, HISTCMD, HOSTTYPE, OSTYPE, MACHTYPE, HOSTNAME,

ENV, PS3, PS4, DIRSTACK, PIPESTATUS, HISTSIZE, HISTFILE,

HISTFILESIZE, HISTCONTROL, HISTIGNORE, GLOBIGNORE, GROUPS,

PROMPT_COMMAND, FCEDIT, FIGNORE, IGNOREEOF, INPUTRC,

SHELLOPTS, OPTERR, HOSTFILE, TMOUT, FUNCNAME, histchars,

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