Filter command
1. grep egrep fgrep
2. sort
sort -d
sort -n
sort -r
sort -f
3. uniq
uniq -d
uniq -u
uniq -c
4. comm
comm -123 file1 file2 -----------------其中123分别代表在file1,file2,同时在file1和file2
5. tr------text replacer(tr 只能进行字符的替换、缩减和删除,不能用来替换字符串)
tr -d
tr -c
tr -s
6. tail