cut是切割文件用,簡單取列的命令html
-b, --bytes=LIST select only these bytes -c, --characters=LIST select only these characters -d, --delimiter=DELIM use DELIM instead of TAB for field delimiter -f, --fields=LIST select only these fields; also print any line that contains no delimiter character, unless the -s option is specified -n with -b: don't split multibyte characters --complement complement the set of selected bytes, characters or fields -s, --only-delimited do not print lines not containing delimiters --output-delimiter=STRING use STRING as the output delimiter the default is to use the input delimiter --help display this help and exit --version output version information and exit
設置特定切割符,取特定的列shell
cut -d '/' -f3 logs.txt 設置/爲切割符 -f 表示第幾列,這裏取第三列
查找特定數量的字符less
[root@localhost ftl]# cat logs.txt /var/log/yum.log hello world [root@localhost ftl]# cut -c 1-5 logs.txt
替換文件內的內容:源文件不受影響this
tr 'var' 'log' < logs_bak.txt| head -3