05-13-2009
Get Nth record from last line
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.
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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
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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. (5 Replies)
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Hi,
I have a input file with the following entries:
1one
2two
3three
1four
2five
3six
1seven
1eight
1nine
2ten
The output should be
1one
2two
3three
1four
2five
3six (2 Replies)
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Hi,
I have a input file with the following entries:
1one
2two
3three
1four
2five
3six
1seven
1eight
1nine
2ten
2eleven
2twelve
1thirteen
2fourteen
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Hi,
For my reuirement, I have to read a file from the 2nd line till the last line<EOF>.
Say,
I have a file as test.txt, which as a header record in the first line followed by records in rest of the lines.
for i in `cat test.txt`
{
echo $i
}
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can you please tell me
(1) how to delete 1st and 3rd line only from a file.
(2) How to delete last 4 lines in a file that has 2 blank lines out of last 4 lines.
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1944-12,5.6
1945-01,9.8
1945-02,6.7
1945-03,9.3
1945-04,5.9
1945-05,0.7
1945-06,0.0
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1945-08,0.0
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1 ab139 0 752566 G A
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My file (the output of an experiment) starts off looking like this,
_____________________________________________________________
Subjects incorporated to date: 001
Data file started on machine PKSHS260-05CP
**********************************************************************
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LEARN ABOUT DEBIAN
plan9-grep
GREP(1) General Commands Manual GREP(1)
NAME
grep, g - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
g [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines that match the pattern, a regular expression as defined in regexp(7) with
the addition of a newline character as an alternative (substitute for |) with lowest precedence. 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.
-e The following argument is taken as a pattern. This option makes it easy to specify patterns that might confuse argument parsing,
such as -n.
-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.
-f The pattern argument is the name of a file containing regular expressions one per line.
-b Don't buffer the output: write each output line as soon as it is discovered.
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 '...'. An expression starting with '*' will treat the rest of the expression as literal characters.
G invokes grep with -n and forces tagging of output lines by file name. If no files are listed, it searches all files matching
*.C *.b *.c *.h *.m *.cc *.java *.cgi *.pl *.py *.tex *.ms
SOURCE
/src/cmd/grep
/bin/g
SEE ALSO
ed(1), awk(1), sed(1), sam(1), regexp(7)
DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)