02-19-2018
Speeding up could be done by NOT executing a bash shell with command / function for every single file name found. Have find write all file names to a temp file, and read that in a while loop, callig the function from within - if a function is needed at all. grepping and sedding the same file means read / process it twice - use sed only to process it once. And, on top of what MadeInGermany already stated, you need to specify the position where to add the addstring if searchstring is missing, unless that were end-of-file.
This User Gave Thanks to RudiC For This Post:
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
I'm trying to grep a string in a line using sed.
My original data looks like this:
MRTG$ grep -i "System" $file
<H1>Traffic Analysis for 15 -- sERITHC3602.t-mobile.co.uk</H1> <TABLE> <TR><TD>System:</TD> <TD>sERITHC3602 in </TD></TR> <TR><TD>Maintainer:</TD> <TD></TD></TR>... (4 Replies)
Discussion started by: viadisky
4 Replies
2. Shell Programming and Scripting
Aloha! I have just over 1k of users that have permissions that they shouldn't under our system. I need to parse a provided list of usernames, check their permissions file, and strip the permissions that they are not allowed to have. If upon the permissions strip they are left with no permissions,... (6 Replies)
Discussion started by: Malumake
6 Replies
3. UNIX for Dummies Questions & Answers
I have a file in which I need to search if a new line character exists on the last line in the file. Please let me know how can I achieve it using Unix commands? (10 Replies)
Discussion started by: sunilbm78
10 Replies
4. Shell Programming and Scripting
I have some txt files. I have to create another text file which contains the portion starting from the format "Date Sex Address" to the end of the file. While using grep -n on Date it also gives me the previous line containg Date. and also Date may be DATE in some files.
My file is like this... (10 Replies)
Discussion started by: Amiya Rath
10 Replies
5. Shell Programming and Scripting
I'm new to using sed and grep commands, but have found them extremely useful. However I am having a hard time figuring this one out:
Delete every line containing the word CEN and the next line as well.
ie. test.txt
blue
324 CEN
green
red
blue
324 CEN
green
red
blue
to produce:... (2 Replies)
Discussion started by: rocketman88
2 Replies
6. Shell Programming and Scripting
Hi,
I simply try to get a string in a line but I do smth. wrong. Hopfefully you can help me ;)
tried smth like:
ggrep -Eo " /folder1/folder2/folder3/* end" get_info_file > temp.file
I played a bit around but could not specify the end string command...
So this is the... (9 Replies)
Discussion started by: unknown7
9 Replies
7. Shell Programming and Scripting
my requirement is,
consider a file output
cat output
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
hellow there
this doesnt look good
et cetc etc
etcetera
i want to replace a line of line number 4 ("this doesnt look good") with some other line
... (3 Replies)
Discussion started by: vivek d r
3 Replies
8. Shell Programming and Scripting
here is what i want to achieve.. i have a file with below contents
cat fileName
blah blah blah
.
.DROP this
REJECT that
.
--sport 7800 -j REJECT --reject-with icmp-port-unreachable
--dport 7800 -j REJECT --reject-with icmp-port-unreachable
.
.
.
more blah blah blah
--dport 3306... (14 Replies)
Discussion started by: vivek d r
14 Replies
9. Shell Programming and Scripting
Hi, I have multiple files on a directory with the following content:
blahblah
blahblah
hostname server1
blahblah
blahblah
---BEGIN---
aaa
bbb
ccc
ddd
---END---
blahblah
blahblah
blahblah
I would like to filter all the files with awk or sed or something else so I can get below... (6 Replies)
Discussion started by: bayupw
6 Replies
10. Shell Programming and Scripting
Is there a command for sed and awk that will only sort the line with more characters?
#cat file
123
12345
12
asdgjljhhho
bac
ss
Output:
asdgjljhhho
#cat file2
11.2
12345.00
21.222
12345678.10 (2 Replies)
Discussion started by: invinzin21
2 Replies
ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)