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add string expression explanation

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添加了一些表达式说明以及对齐注释
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齐 2021-06-13 20:14:14 +08:00 committed by GitHub
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commit 96048c4fd0
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1 changed files with 10 additions and 6 deletions
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docs/operating-system/Shell.md
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@ -235,7 +235,11 @@ echo ${str:0:10} #输出:SnailClimb
#author:amau #author:amau
var="https://www.runoob.com/linux/linux-shell-variable.html" var="https://www.runoob.com/linux/linux-shell-variable.html"
# %表示删除从后匹配, 最短结果
# %%表示删除从后匹配, 最长匹配结果
# #表示删除从头匹配, 最短结果
# ##表示删除从头匹配, 最长匹配结果
# 注: *为通配符, 意为匹配任意数量的任意字符
s1=${var%%t*} #h s1=${var%%t*} #h
s2=${var%t*} #https://www.runoob.com/linux/linux-shell-variable.h s2=${var%t*} #https://www.runoob.com/linux/linux-shell-variable.h
s3=${var%%.*} #http://www s3=${var%%.*} #http://www