shell 技巧

[shimei@10.3.149.73 scripts]$ a="abc|def|ghi"
[xxx@10.3.149.73 scripts]$ echo ${a%|*}
abc|def
[xxx@10.3.149.73 scripts]$ echo ${a%%|*}
abc
[xxx@10.3.149.73 scripts]$ echo ${a##|*}
abc|def|ghi
[xxx@10.3.149.73 scripts]$ man bash
[xxx@10.3.149.73 scripts]$ echo ${a##|*}
abc|def|ghi
[xxx@10.3.149.73 scripts]$ echo ${a##|*}
abc|def|ghi
[xxx@10.3.149.73 scripts]$ echo ${a##*|}
ghi
[xxx@10.3.149.73 scripts]$ echo ${a#*|}
def|ghi