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grep
grep '[[:lower:]]' filename #lower-alpha
grep '\(ab\)\(cd\)[def]*\2\1 #find ab then cd then [def] then cd than ab houxiangyinyong

sed
sed 's/Tolstoy/Camus/' filename        #just change the first one
sed 's/Tolstoy/Camus/g' filename       #change all
sed 's/Tolstoy/Camus/2' filename       #change the second one
sed -n '3,5p' filename                 #print from line 3 to 5
sed '/xixi/,/haha/ s/baz/quux/g' filename   #find lines containing xixi and haha
                                            #then replace baz with quux in these lines
sed '/used/! s/new/used/g' filename    #find lines not containing used
sed '/^#/d' filename | sort > filename.sorted        #find lines containg # at the beginning
                                                #then delet

tail
tail -7 filename                       # print last 7 lines
tail -7 filename > 1                   # print last 7 lines in 1

cut
cut -b 3 filename                     # print the third byte from each line
cut -d : -f 1 filename                # -d customized separator -f field


joint
joint file1 file2                      # file1 and file2 should be in the same format
joint -a1 file1 file2                      # show the difference in file1


awk
awk -F: '{print $1,$2}' filename      # F--field separator print field 1 and 2
awk -F: -v 'OFS=**' '{print $1,$2}' filename        # v--variable OFS--output field sparator

sort
sort filename                              # sort according to ASCII
sort -u filename                      # sort according to ASCII and then delete repeated term
sort -r filename                      # descending order
sort filename -o filename              # sort and then print in the same file
sort -n filename                      # sort according to the number
sort -n -t : -k 2 filename              # -n sort according to the number -t consider colon as separator -k which row

uniq
sort latin-numbers | uniq              # no repeated lines
sort latin-numbers | uniq -c          # recorf repeated time
sort latin-numbers | uniq -d              # show the repeated term
sort latin-numbers | uniq -u          # show the non-repeated term

wc
wc -c                                      # calculate the number of bytes
wc -l                                      # calculate the number of lines
wc -w                                      # calculate the number of words
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