Practical *nix utilities(for text processing)

grep | sed | awk | xargs | etc

whoami

/

sed vim

awk

ls

cattac

head

tail split

wc

sumsort

uniqkill

cut

paste

join

tr

dir

mv duecho

test

expr

tee

grep

/

DB

Mega

AppFiles

Log

pwd | ls | find | tee

GNU Coreutilshttp://www.gnu.org/software/coreutils/

The takeaway command: man> info coreutils

pwd | ls | find | teeList of files:

ls –lls –1ls –latr

find . –name *.txt

pwd | ls | find | teeSeek for a string in a file:

grep “cat” file.txtgrep –v “dog” file.txtgrep –i “PaTtErN” file.txtegrep “cat|dog” file.txtzgrep “cat” file.txt.gz

for / xargs

for file in `find . –name *tmp` do rm $file donefind . –name *tmp | xargs rm

Do something with each file:

pwd | ls | find | teefind + grep

find . -name '*txt' -exec grep -l aaa {} \;

find . -name '*txt' | xargs grep -l aaa

pwd | ls | find | tee

ls

cattac

head

tail split

wc

sumsort

uniqkill

cut

paste

join

tr

dir

mv duecho

test

expr

tee

grep

paste

join

sort | uniq

wc

cut

csplit

sed awk

sed s for substitution

sed ‘s/cat/dog/’ # cat -> dog

sed ‘s/\(a\)\(b\)/\2\1/’# ab -> ba

sed p for printing

sed –n ‘/dog/p’ # print lines that match ‘dog’

sed –n ‘/start/,/end/p’# print range

sed d to delete

sed ‘/dog/d’# delete lines that match ‘dog’

sed ‘1,/pattern/d’# delete range

sed | and –e for invocation

sed ‘s/a/A/’ | sed ‘s/b/B/’# sed –e ‘s/a/A/’ –e ‘s/b/B/’ #

sed { .. } to group the commands

sed ‘/pattern/ { s/p/P/ s/e/E/ }’#pattern -> PattErn

sed r to read a file

sed ‘/include/ r file.txt’# insert file.txt after include

w to write to a file

sed ‘/pattern/ w file.txt’# write matched lines to a file

sedtris

awkaaa bbb cccaaa bbb zzz

awk '/zzz/' 1.txt grep zzz 1.txt

aaa bbb zzz

awkawk 'BEGIN {<initializations>} <pattern 1> {<actions>} <pattern 2> {<actions>} ... END {<final actions>}'

awkawk 'BEGIN {a=0, b=0} /aaa/ {a++} /bbb/ {b++} END {printf “%d\t%d”,a,b}'

awk

awk '{arr[$2]+=$1} END { for (id in arr) printf "%s\t%d\t\n",id,arr[id]}'

exit

@antonarhipov