Shell碎碎念

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1. 字串如何大小寫轉換

str="This is a Bash Shell script."

1> tr方式     

newstr=`tr ‘[A-Z]‘ ‘[a-z]‘ <<<"$str"`或者 newstr=$(echo $str |tr ‘[a-z]‘ ‘[A-Z]‘)

2> typeset 

typeset -u VARIABLE (把VARIABLE的小寫轉換成大寫)

typeset -l VARIABLE (把VARIABLE的大寫轉換成小寫)

如：

[[email protected] ~]$ typeset -u str
[[email protected] ~]$ str="This is a Bash Shell script."
[[email protected] ~]$ echo $str
THIS IS A BASH SHELL SCRIPT.

 

Shell碎碎念