Extracting lines that contain an exact phrase that includes a tab

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I have a file that contains the following lines

50[tab]H[tab]1
44[tab]H[tab]2
4[tab]H[tab]3
4[tab]H[tab]4
44[tab]H[tab]5
234[tab]H[tab]6

I would like to only extract the last line that starts with the exact phrase "4[tab]H" (so this would be "4[tab]H[tab]4") into another file. I have tried:

grep "^4*.H" filein.in | tail -1 >> fileout.out

but instead it extracts "44[tab]H[tab]5". I need it to extract the last line that starts with the exact string: "4[tab]H".

asked Mar 31 at 23:48

A. B

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up vote
0
down vote

favorite

I have a file that contains the following lines

50[tab]H[tab]1
44[tab]H[tab]2
4[tab]H[tab]3
4[tab]H[tab]4
44[tab]H[tab]5
234[tab]H[tab]6

I would like to only extract the last line that starts with the exact phrase "4[tab]H" (so this would be "4[tab]H[tab]4") into another file. I have tried:

grep "^4*.H" filein.in | tail -1 >> fileout.out

but instead it extracts "44[tab]H[tab]5". I need it to extract the last line that starts with the exact string: "4[tab]H".

asked Mar 31 at 23:48

A. B

224

add a commentÂ |Â

up vote
0
down vote

favorite

I have a file that contains the following lines

50[tab]H[tab]1
44[tab]H[tab]2
4[tab]H[tab]3
4[tab]H[tab]4
44[tab]H[tab]5
234[tab]H[tab]6

I would like to only extract the last line that starts with the exact phrase "4[tab]H" (so this would be "4[tab]H[tab]4") into another file. I have tried:

grep "^4*.H" filein.in | tail -1 >> fileout.out

but instead it extracts "44[tab]H[tab]5". I need it to extract the last line that starts with the exact string: "4[tab]H".

asked Mar 31 at 23:48

A. B

224

I have a file that contains the following lines

50[tab]H[tab]1
44[tab]H[tab]2
4[tab]H[tab]3
4[tab]H[tab]4
44[tab]H[tab]5
234[tab]H[tab]6

I would like to only extract the last line that starts with the exact phrase "4[tab]H" (so this would be "4[tab]H[tab]4") into another file. I have tried:

grep "^4*.H" filein.in | tail -1 >> fileout.out

but instead it extracts "44[tab]H[tab]5". I need it to extract the last line that starts with the exact string: "4[tab]H".

asked Mar 31 at 23:48

A. B

224

asked Mar 31 at 23:48

A. B

224

asked Mar 31 at 23:48

A. B

224

asked Mar 31 at 23:48

A. B

224

add a commentÂ |Â

3 Answers
3

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up vote
4
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accepted

In ksh93/zsh/bash/mksh/FreeBSD sh:

grep $'^4tH' filein.in | tail -n 1

Or in any shell:

awk '/^4tH/ line=$0; ; END if(line!="") print line; ' filein.in

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

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up vote
1
down vote

With gnu sed

sed '/^4tH/h;$bA;N;D;:A;x;/^$/d' infile

answered Apr 1 at 9:52

ctac_

1,016116

2

Or gsed -n '/^4tH/h;$g;/./p;'
â€“Â StÃ©phane Chazelas
Apr 1 at 10:10

1

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

add a commentÂ |Â

up vote
0
down vote

You can also reverse the input file line wise using tac and then get first match

$ # add another t after H if needed
$ tac ip.txt | grep -m1 $'^4tH'
4 H 4

$ tac ip.txt | awk -F't' '$1=="4" && $2=="H"print; exit'
4 H 4

answered Apr 1 at 2:22

Sundeep

6,9511826

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

up vote
4
down vote

accepted

In ksh93/zsh/bash/mksh/FreeBSD sh:

grep $'^4tH' filein.in | tail -n 1

Or in any shell:

awk '/^4tH/ line=$0; ; END if(line!="") print line; ' filein.in

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

add a commentÂ |Â

up vote
4
down vote

accepted

In ksh93/zsh/bash/mksh/FreeBSD sh:

grep $'^4tH' filein.in | tail -n 1

Or in any shell:

awk '/^4tH/ line=$0; ; END if(line!="") print line; ' filein.in

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

add a commentÂ |Â

up vote
4
down vote

accepted

In ksh93/zsh/bash/mksh/FreeBSD sh:

grep $'^4tH' filein.in | tail -n 1

Or in any shell:

awk '/^4tH/ line=$0; ; END if(line!="") print line; ' filein.in

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

In ksh93/zsh/bash/mksh/FreeBSD sh:

grep $'^4tH' filein.in | tail -n 1

Or in any shell:

awk '/^4tH/ line=$0; ; END if(line!="") print line; ' filein.in

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

edited Apr 1 at 10:08

StÃ©phane Chazelas

280k53514846

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

answered Mar 31 at 23:56

Hauke Laging

53.2k1282130

add a commentÂ |Â

up vote
1
down vote

With gnu sed

sed '/^4tH/h;$bA;N;D;:A;x;/^$/d' infile

answered Apr 1 at 9:52

ctac_

1,016116

2

Or gsed -n '/^4tH/h;$g;/./p;'
â€“Â StÃ©phane Chazelas
Apr 1 at 10:10

1

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

add a commentÂ |Â

up vote
1
down vote

With gnu sed

sed '/^4tH/h;$bA;N;D;:A;x;/^$/d' infile

answered Apr 1 at 9:52

ctac_

1,016116

1

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

add a commentÂ |Â

up vote
1
down vote

With gnu sed

sed '/^4tH/h;$bA;N;D;:A;x;/^$/d' infile

answered Apr 1 at 9:52

ctac_

1,016116

With gnu sed

sed '/^4tH/h;$bA;N;D;:A;x;/^$/d' infile

answered Apr 1 at 9:52

ctac_

1,016116

answered Apr 1 at 9:52

ctac_

1,016116

answered Apr 1 at 9:52

ctac_

1,016116

answered Apr 1 at 9:52

ctac_

1,016116

1

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

add a commentÂ |Â

1

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

Or gsed '/^4tH/h;$!d;g;/./!d'
â€“Â ctac_
Apr 1 at 10:36

add a commentÂ |Â

up vote
0
down vote

You can also reverse the input file line wise using tac and then get first match

$ # add another t after H if needed
$ tac ip.txt | grep -m1 $'^4tH'
4 H 4

$ tac ip.txt | awk -F't' '$1=="4" && $2=="H"print; exit'
4 H 4

answered Apr 1 at 2:22

Sundeep

6,9511826

add a commentÂ |Â

up vote
0
down vote

You can also reverse the input file line wise using tac and then get first match

$ # add another t after H if needed
$ tac ip.txt | grep -m1 $'^4tH'
4 H 4

$ tac ip.txt | awk -F't' '$1=="4" && $2=="H"print; exit'
4 H 4

answered Apr 1 at 2:22

Sundeep

6,9511826

add a commentÂ |Â

up vote
0
down vote

You can also reverse the input file line wise using tac and then get first match

$ # add another t after H if needed
$ tac ip.txt | grep -m1 $'^4tH'
4 H 4

$ tac ip.txt | awk -F't' '$1=="4" && $2=="H"print; exit'
4 H 4

answered Apr 1 at 2:22

Sundeep

6,9511826

You can also reverse the input file line wise using tac and then get first match

$ # add another t after H if needed
$ tac ip.txt | grep -m1 $'^4tH'
4 H 4

$ tac ip.txt | awk -F't' '$1=="4" && $2=="H"print; exit'
4 H 4

answered Apr 1 at 2:22

Sundeep

6,9511826

answered Apr 1 at 2:22

Sundeep

6,9511826

answered Apr 1 at 2:22

Sundeep

6,9511826

answered Apr 1 at 2:22

Sundeep

6,9511826

add a commentÂ |Â

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