编写shell脚本的问题

sailer

我从shell脚本中得到目录名，例如：/usr/local/aa/bb/cc
现在要把这个目录名中的cc提取出来，不知道用什么命令？

demonlj

echo  "/usr/local/aa/bb/cc" | cut -b 18-
上面可以土土的搞定，下面是用gawk的方法
echo  "/usr/local/aa/bb/cc" | gawk -F"/" '{print $6}'

VimChina

用basename这个命令就可以得到了

twf_cc

[victor@localhost ~]$ a="/usr/local/aa/bb/cc"
[victor@localhost ~]$ echo ${a##*/}
cc
[victor@localhost ~]$

VimChina

[quote:0029301de5="twf_cc"][victor@localhost ~]$ a="/usr/local/aa/bb/cc"
[victor@localhost ~]$ echo ${a##*/}
cc
[victor@localhost ~]$[/quote]
why not use this method :
[code:1]
$ a="/usr/local/aa/bb/cc"
$ basename $a
[/code:1]

twf_cc

[quote:b53d73efdd="VimChina"][quote:b53d73efdd="twf_cc"][victor@localhost ~]$ a="/usr/local/aa/bb/cc"
[victor@localhost ~]$ echo ${a##*/}
cc
[victor@localhost ~]$[/quote]
why not use this method :
[code:1]
$ a="/usr/local/aa/bb/cc"
$ basename $a
[/code:1][/quote]

因為是內建 bash 命令，快得多。

VimChina

[quote:8890713e77="twf_cc"][quote:8890713e77="VimChina"][quote:8890713e77="twf_cc"][victor@localhost ~]$ a="/usr/local/aa/bb/cc"
[victor@localhost ~]$ echo ${a##*/}
cc
[victor@localhost ~]$[/quote]
why not use this method :
[code:1]
$ a="/usr/local/aa/bb/cc"
$ basename $a
[/code:1][/quote]

因為是內建 bash 命令，快得多。[/quote]
看看哪个更简洁，便于阅读和理解，所以我更喜欢用basename

zhy2111314

basename is enough

demonlj

比较直接

sailer

谢谢各位

haHAL

[hahal@localhost ~]$ a="/usr/local/aa/bb/cc"

用字符串操作命令：basename $a 可提取cc;剩下的部分可以用dirname  $a 提取 。