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UNIX for Dummies Questions & Answers
Grep if the name exists, otherwie leave blank
Post 302737599 by pamu on Thursday 29th of November 2012 09:14:28 AM
11-29-2012
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1. Shell Programming and Scripting
Hello everyone... please help if you can -- I'm stumped. Making this work will save me hours of manual labor:
I need to search file2 for pattern in file1. If pattern found append file2 line to file3. If pattern not found append a blank line to file3.
file1 contents example:
123
456
789... (6 Replies)
Discussion started by: michieka
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2. UNIX for Dummies Questions & Answers
I want to exclude (-v) blank records from a file before analysing it.
I know I can use '^]$' for spaces and tabs but how do you look for lines that have nothing (/n or line feed) ? (2 Replies)
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3. Shell Programming and Scripting
Hi,
I have log file like this:
i want grep the log file without blank lines in column 4. So the file is become like this :
What is the command?
please help me. (1 Reply)
Discussion started by: justbow
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4. UNIX for Dummies Questions & Answers
hi!
i'm trying to get grep to do an exact match for the following pattern but..it's not quite working. I'm not too sure where did I get it wrong. any input is appreciated.
echo "$VAR" | grep -q '^test:]name'
if ; then
printf "test name is not found \n"
fi
on... (4 Replies)
Discussion started by: jazzaddict
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5. Shell Programming and Scripting
Hi,
I have two files say xxx.txt and yyy.txt. xxx.txt is with list of patterns within double quotes. Eg.
"this is the line1"
"this is the line2"
The yyy.txt with lot of lines. eg:
"This is a test message which contains rubbish information just to fill the page which is of no use. this is... (3 Replies)
Discussion started by: abinash
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6. Shell Programming and Scripting
Hi all,
I've googling around forum regarding my prob, the nearest would same as thread tittled Insert blank line if grep not found, but she/he did not mention the solution, so I would like to request your help
I've this task, to search in file2 based on pattern in file1 and output it to... (4 Replies)
Discussion started by: masterpiece
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7. UNIX for Dummies Questions & Answers
The following grep command grep -v "^$" filename > newfilename does not populate the new file with any data. I see it search the entire input file but the output file never gets filled. Is this not the correct command for what Im looking to do? (2 Replies)
Discussion started by: aispg8
2 Replies
8. Shell Programming and Scripting
Hi All,
Need help to grep blank and copy to file. I have a file in below format
dns1dm06_10,
dns2dm02_04,
dbidub,10000000c9a46d0c
gbpuhci,10000000c948b00a
ibtur001,10000000c9a1ccda
yubkbtp1,10000000c93fec5b
I need to copy to all lines which doesn't have wwn >> no-wwn.txt
1... (2 Replies)
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9. Shell Programming and Scripting
Hi All
Need Help
I have a file with the below format (ABC.TXT) :
®¿¿ABCDHEJJSJJ|XCBJSKK01|M|7348974982790
HDFLJDKJSKJ|KJALKSD02|M|7378439274898
KJHSAJKHHJJ|LJDSAJKK03|F|9898982039999
(cont......)
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10. Shell Programming and Scripting
Hello,
I'm trying to figure out how to speed up the following as I want to use multiple commands to search thousands of files.
is there a way to speed things up?
Example I want to search a bunch of files for a specific line, if this line already exists do nothing, if it doesn't exist add it... (4 Replies)
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LEARN ABOUT MINIX
readahead
readahead(8) System Manager's Manual readahead(8) NAME
readahead - file preloader for boot process optimization SYNOPSIS
readahead [options] <file-list> [another-file-list [...]] DESCRIPTION
readahead is a files preloader designed to optimize the disk I/O during the boot process. OPTIONS
-b, --build build optimised files list only, without sorting. -s, --sort build and sort list of files only (implies -b). -o, --output <file> write sorted list of files to file. -d, --dont-sort preload files described by an already sorted files list. -h, --help print the usage information. -v, --verbose enable the verbose mode. -t, --timing report time spent on each operation. -m, --maxsize <max size> maximum size in KiB a file can be in order to be preloaded, default is 10240. <file-list> [another-file-list [...]] One or more files containing the list of files to be preloaded or sorted. The files list can be generated by readahead-collector(8). FILES
/etc/default/readahead-fedora SEE ALSO
readahead-collector(8), readahead(2), AUTHORS
Arjan van de Ven <arjan@infradead.org>, Ziga Mahkovec <ziga.mahkovec@klika.si>, Karel Zak <kzak@redhat.com>, This manual page was written by Raphael Geissert <geissert@debian.org> July 2011 readahead(8)