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SHELL STUDY....tr的用法

2024-07-17 16:34:55   219人阅读

一般我们使用tr来做字符串的替换，或者删除指定的字符串

tr的语法如下：

  tr [OPTION]... SET1 [SET2]

       -c, -C, --complement

              first complement SET1

将非SET1中的字符替换为SET2


[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr -c "l" "A"
lAAAAAAA

       -d, --delete
              delete characters in SET1, do not translate

删除包含了SET1中的字符：

[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr -d "u"
lbins


[lubinsu@200-168-1-4 ~]$ echo "lu123b123ins41u" | tr -d "0-9"
lubinsu

       -s, --squeeze-repeats              replace  each  input  sequence  of  a  repeated character that is listed in SET1 with a single
              occurrence of that character

去除重复字符，压缩为一个字符：

[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr -c "l\n" "A"
lAAAAAA
[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr -cs "l\n" "A"
lA

       -t, --truncate-set1

              first truncate SET1 to length of SET2

默认为-t：

[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr -t "lu" "abc"
abbinsb
[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr "lu" "abc"
abbinsb

其他示例：

大小写替换：

[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr "a-z" "A-Z"
LUBINSU
[lubinsu@200-168-1-4 ~]$ echo "lubinsu" | tr [:lower:] [:upper:]
LUBINSU


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