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This is a file . I want to remove the repetition in the name of patch

[ppande@server-1 —]$egrep 'Patch[0-9].*.*:' content1
Patch1001 : snmp fixl.org
Patch1002 : dhcp tmp fix
Patch1003 : qemu-img-9.0.58
Patch001 : snmp fixl.org
Patch002 : dhcp installation
Patch003 : qemu
Patch004 : snmp fixl.org

I used 'sort -u' but here the order of the patch is changed . All I need is the output with out repetitions and order remains same , or in other words if there is a repetition the second/last occurrence must not be displayed . 

[ppande@server-1 —]$egrep 'Patch[0-9].*.*:' content1 | sort -u -k3
Patch002 : dhcp installation
Patch1002 : dhcp tmp fix
Patch003 : qemu
Patch1003 : qemu-img-0.0.58
Patch1001 : snmp fixl.org
Patch001 : snmp fixl.org

Desired output:

Patch1001 : snmp fixl.org
Patch1002 : dhcp tmp fix
Patch1003 : qemu-img-9.0.58
Patch002 : dhcp installation
Patch003 : qemu
RavinderSingh13
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Unixquest945
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2 Answers2

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You can do that in a single awk command.

awk -F ':\\s*' '/^Patch[0-9]+\s*:/ && !a[$2]++' content1
oguz ismail
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1

EDIT: Since oguzismail added same solution few secs before me so adding perl solution now if you are ok with it.

perl -aF': ' -lne 'print if ! $seen{$F[1]}++'  Input_file

Could you please try following. You need not to use multiple commands along with awk here.

awk -F': '  '/Patch[0-9].*.*/ && !a[$2]++'  Input_file
RavinderSingh13
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  • Ravinder , this Perl oneliner wont work as I tried it make more noise of unwanted lines those that have a string followed by colon . The lines with 'Patch[[:digit:]]:' is fetched but few more lines with ':' is also displayed . – Unixquest945 Dec 17 '18 at 09:09