Ako simulovať egrep s inými príkazmi? - linux, bash, awk, grep

Musím simulovať egrep plus niektoré možnosti s inými príkazmi, hlavne awk, ale naozaj nerozumiem, ako to urobiť v scenári. Viem to awk rozpoznáva regulárne výrazy, ale môže to byť náhrada za egrep?

Naozaj neviem, kde začať.

odpovede:

3 pre odpoveď č. 1

Použitý vzorový súbor:

[jaypal:~/Temp] cat file
This is FirstLine
SecondLineEEE
AAAblablabla
ForthLineEEE
FifthLine
LastLine

simulácie:

1. egrep -n

[jaypal:~/Temp] egrep -n "LastLine" file
6:LastLine
[jaypal:~/Temp] awk /LastLine/"{print NR":"$0}" file
6:LastLine

2. egrep -v

[jaypal:~/Temp] egrep -v "LastLine" file
This is FirstLine
SecondLineEEE
AAAblablabla
ForthLineEEE
FifthLine
[jaypal:~/Temp] awk "/LastLine/{next}1" file
This is FirstLine
SecondLineEEE
AAAblablabla
ForthLineEEE
FifthLine

alebo (ako uvádza Dennis v komentároch)

[jaypal:~/Temp] awk "!/LastLine/" file
This is FirstLine
SecondLineEEE
AAAblablabla
ForthLineEEE
FifthLine

3. egrep -i (Toto je iba v gnu awk)

[jaypal:~/Temp] egrep -i "lastline" file
LastLine
[jaypal:~/Temp] gawk -v IGNORECASE=1 "/lastline/" file
LastLine

4. egrep -w (Toto je iba v gnu awk)

[jaypal:~/Temp] egrep -w "is" file
This is FirstLine
[jaypal:~/Temp] gawk "/<is>/" file
This is FirstLine

5. egrep -f

[jaypal:~/Temp] cat file
This is FirstLine
SecondLineEEE
AAAblablabla
ForthLineEEE
FifthLine
LastLine

[jaypal:~/Temp] cat patternfile
LastLine
is

[jaypal:~/Temp] egrep -f patternfile file
This is FirstLine
LastLine

[jaypal:~/Temp] awk "NR==FNR{a[$0]++;next} {for (x in a) if ($0~x) print $0}" patternfile file
This is FirstLine
LastLine

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