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cut -cchars file
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    -c5     ÌáÈ¡µÚ5¸ö×Ö·û
        -c5-    ÌáÈ¡µÚ5¸ö×Ö·ûÒÔºóµÄ×Ö·û
        -c1,5,12  ÌáÈ¡¶à¸ö×Ö·û£¬ÖмäÓÓ,”·ûºÅ¸ô¿ª
        -c5-14  ÌáÈ¡µÚ5¸ö×Ö·ûµ½µÚ14¸ö×Ö·û¼äµÄ×Ö·û
http://gan.cublog.cn
[service@dsg tmp]$ cat f.txt
service  pts/0        Oct  9 20:27 (211.95.114.235)
service  pts/1        Oct  9 21:06 (218.80.203.242)
service  pts/2        Oct  9 14:35 (218.80.203.242)
service  pts/3        Oct  9 21:07 (218.80.213.242)
service  pts/4        Oct  9 21:07 (218.80.213.242)
service  pts/5        Oct  9 21:45 (58.31.205.19)
[service@dsg tmp]$ cut -c5 f.txt
i
i
i
i
i
i
[service@dsg tmp]$ cut -c5- f.txt   
ice  pts/0        Oct  9 20:27 (211.95.114.235)
ice  pts/1        Oct  9 21:06 (218.80.203.242)
ice  pts/2        Oct  9 14:35 (218.80.203.242)
ice  pts/3        Oct  9 21:07 (218.80.213.242)
ice  pts/4        Oct  9 21:07 (218.80.213.242)
ice  pts/5        Oct  9 21:45 (58.31.205.19)
[service@dsg tmp]$ cut -c1,5,14 f.txt
si0
si1
si2
si3
si4
si5
------------------------------
cut -d -f
 -d, --delimiter=DELIM
              use DELIM instead of TAB for field delimiter
 -


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