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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2. UNIX for Dummies Questions & Answers
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
The output should be: (5 Replies)
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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
}
While doing the above loop, I have read... (5 Replies)
Discussion started by: machomaddy
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6. UNIX for Dummies Questions & Answers
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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Is there an awk script that can easily perform the following operation?
I have a data file that is in the format of
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
1945-07,0.0
1945-08,0.0
1945-09,0.0
1945-10,0.2
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Hi all,
Greetings. I am facing some troubles and hope that the professionals here could help me.
I am handling a large dataset, and part of it is like below:
1 ab139 0 752566 G A
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1 ab142 0 854250 G A
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Hi All,
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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
**********************************************************************
Subject 1,... (9 Replies)
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LEARN ABOUT DEBIAN
prophet::cli::texteditorcommand
Prophet::CLI::TextEditorCommand(3pm) User Contributed Perl Documentation Prophet::CLI::TextEditorCommand(3pm)
separator_pattern
A pattern that will match on lines that count as section separators in record templates. Separator string text is remembered as $1.
comment_pattern
A pattern that will match on lines that count as comments in record templates.
build_separator $text
Takes a string and returns it in separator form. A separator is a line of text that denotes a section in a template.
build_template_section header => '=== foo ===' [, data => 'bar']
Takes a header text string and (optionally) a data string and formats them into a template section.
try_to_edit template => $tmpl [, record => $record ]
Edits the given template if possible. Passes the updated template in to process_template (errors in the updated template must be handled
there, not here).
handle_template_errors error => 'foo', template_ref => $tmpl_str, bad_template => 'bar', rtype => 'ticket'
Should be called in "process_template" if errors (usually validation ones) occur while processing a record template. This method prompts
the user to re-edit and updates the template given by "template_ref" to contain the bad template (given by the arg "bad_template" prefixed
with the error messages given in the "error" arg. If an errors section already exists in the template, it is replaced with an errors
section containing the new errors.
If the template you are editing is not section-based, you can override what will be prepended to the template by passing in the
"errors_pattern" argument, and passing in "old_errors" if a template errors out repeatedly and there are old errors in the template that
need to be replaced.
Other arguments are: "rtype": the type of the record being edited. All arguments except overrides ("errors_pattern" and "old_errors" are
required.
calling code must implement
run process_template
perl v5.10.1 2009-08-17 Prophet::CLI::TextEditorCommand(3pm)