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Old 09-05-2017, 09:45 AM   #1
freeroute
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Registered: Jul 2016
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sed - skip (or delete) first n line than continue


Using sed, I would like to delete first n line from a file, than continue other commands.

I know
Quote:
sed 1,4d
, but its maybe not good for me, because I use complex command.
Quote:
sed 1,4d
means delete from 1st line to 4th line, than EXIT. I would like to delete the 1st 4 line, than continue....)

Now I use this commands:

Code:
sed -E 's/([a-zA-Z0-9.@]+):([a-z0-9._-]+@[a-z0-9.-]+\.[a-z]+{2,4}):([0-9]+.[0-9]+.[0-9]+.[0-9]+):(.*)/\1 \2 \3/' pix.txt | sed 1,4d | less
pix.txt first n line:

Code:
BY @xxxxxxx THE SUN GOES DOWN…
twitter.com/xxxxxxxxx

concat_ws(':',name,email,ip_address,members_pass_hash,members_pass_salt)
USER1:username@pixarra.com:00.00.149.106:0fb88e5bf21eddd113cdaff1e0f5cfa2:-yh#]
USER2:username@shasta.com:00.106.00.148:9225fdc2aed7e7c8b372d15e52486a73:0aUBr
USER3:username@comcast.net:00.163.00.62:46e3c1ed2f8ffbadcc0bcdb17a4afe1a:pbx]q
Thanks for your help.
 
Old 09-05-2017, 11:59 AM   #2
Turbocapitalist
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Registered: Apr 2005
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Perhaps you mean this?

Code:
sed -E -e '1,4d; s/([a-zA-Z0-9.@]+):([a-z0-9._-]+@[a-z0-9.-]+\.[a-z]+{2,4}):([0-9]+.[0-9]+.[0-9]+.[0-9]+):(.*)/\1 \2 \3/' pix.txt;
It will delete only the first four lines then process the rest with s///
 
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Old 09-05-2017, 12:05 PM   #3
freeroute
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Registered: Jul 2016
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Quote:
Originally Posted by Turbocapitalist View Post
Perhaps you mean this?

Code:
sed -E -e '1,4d; s/([a-zA-Z0-9.@]+):([a-z0-9._-]+@[a-z0-9.-]+\.[a-z]+{2,4}):([0-9]+.[0-9]+.[0-9]+.[0-9]+):(.*)/\1 \2 \3/' pix.txt;
It will delete only the first four lines then process the rest with s///

Thanks, it works.
I tried 1,4d without semicolon, with no success.
Quote:
-e
is important?
 
Old 09-05-2017, 12:08 PM   #4
Turbocapitalist
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No problem. sed is actually a programming language and 'd' is one of the commands. So is 's' So the semicolon is important to separate the individual commands.

Check the manual page

Code:
man sed
Using the -e to denote the script is a good idea if you start adding other options.
 
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