Shell碎碎念

1. 字符串如何大小写转换

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的小写转换成大写)

typeset -l VARIABLE (把VARIABLE的大写转换成小写)

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.