tr - 转换或删除字符
tr [OPTION] . . . [SET1] [SET2]
描述
$echo aabbccddabcd | tr "cd" "ab"
-c, -C, --complement
$echo aabbccddabcd | tr -c "cd" "e"
$echo aabbccddabcd | tr -c "cd" "abe"
(其中SET2相当于"e")
$echo aabbccddabcd | tr -s "cd"
$echo aabbccddabcd | tr -s "cd" "ab"
$echo aabbccddabcd | tr -s "abcd"
-t, --truncate-set1
$echo aabbccddabcd | tr -t "abcd" "0"
--help 显示帮助并退出
--version 输出版本信息并退出