09-02-2011
Print first, second, every nth, and last record
does anyone have an awk one-liner to:
print the first line, the second line, then every Nth line, and the last line of a file.
Thanks,
Kenny.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I have a comma-separated record and I'd like to use sed to pull the Nth record from it.
It seems like it'd need to be something like this: sed -n 's/'"\,$1\,"'/&/p'
Am I close? (3 Replies)
Discussion started by: doubleminus
3 Replies
2. UNIX for Advanced & Expert Users
I have i got a requirement like below.
I have input file which contains following fixed width records.
00000000000088500232007112007111
I need the full record and concatenated with ~ and characters from 1to 5 and concatenated with ~ and charactes from 10 to 15
The out put will be like... (1 Reply)
Discussion started by: ukatru
1 Replies
3. Shell Programming and Scripting
I have a growing file . I knew only last few lines which is constant for evey job run. I'd need to pull the Nth record from the last line. In this case i should not use search pattern. (2 Replies)
Discussion started by: ford2020
2 Replies
4. Shell Programming and Scripting
Hi,
Is there any short method to print from a particular field till another filed using awk?
Example File:
File1
====
1|2|acv|vbc|......|100|342
2|3|afg|nhj|.......|100|346
Expected output:
File2
====
acv|vbc|.....|100
afg|nhj|.....|100 (8 Replies)
Discussion started by: machomaddy
8 Replies
5. Shell Programming and Scripting
Dear all,
How to print every nth line. File like this:
File input:
1
1
1
1
1
1
2
2
2
3
3
3
3
3
3 (3 Replies)
Discussion started by: attila
3 Replies
6. UNIX for Dummies Questions & Answers
Hey,
I'm sure this is answered somewhere but my Googling has turned up nothing. I have a file with data in the following format:
<desription of event> at <time and date>The desription of the event is variable length and hence when the list is displayed it is hard to easily see the date (and... (8 Replies)
Discussion started by: RECrerar
8 Replies
7. Shell Programming and Scripting
Bash/Oracle Linux 6.4
A basic requirement.
How can I get nth line of a file printed ? Can I use grep in this case ?
Example:
In the below file, 12th line is "Kernel parameter check passed for rmem_max" . I just want the 12 line to be printed.
# cat sometext.txt
Kernel version check... (2 Replies)
Discussion started by: John K
2 Replies
8. AIX
Please help me
print nth line after match
awk or sed one line command. (3 Replies)
Discussion started by: sushma123
3 Replies
9. UNIX for Beginners Questions & Answers
For some reason I am having difficulty performing what should be a fairly easy task. I would like to print lines of a file that have a unique value in the first field. For example, I have a large data-set with the following excerpt:
PS003,001 MZMWR/ L-DWD// *
PS003,001... (4 Replies)
Discussion started by: jvoot
4 Replies
10. UNIX for Beginners Questions & Answers
I wish to print first, third and sixth till the last column from the output of ls command
ls -ltr /app/deploy.yml
-rw-rw-r-- 1 user1 dba 27342 Aug 28 10:17 /app/deploy.yml
Desired Output:
Below command gives me the desired output.
ls -ltr /app/deploy.yml | awk '{$2=$4=$5=""; print... (6 Replies)
Discussion started by: mohtashims
6 Replies
GREP(1) General Commands Manual GREP(1)
NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO
ed(1), awk(1), sed(1), sam(1), regexp(6)
DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)