Programming :: Bash Script Trying To Remove A Leading 'and A Tailing'?

Mar 28, 2010

I have a script that calls for a file description on a core file. I then pull the name of the process that caused the core file.
unfortunately, the process name is pulled with a leading ' amd a tailing'. I would like to remove the leading char and the last char.


VAR=`file /tmp/core.1432 | awk '{ print $14}'`
echo "Process Name: $VAR"


Process Name: 'ProcessName'

Results I need:

Process Name: ProcessName

I tried sed, but it seems to not like using the special char '.

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Programming :: Bash Scripting: How To Keep Leading 0 On ' And '

Jan 27, 2010

I'm trying to put together a script that will quickly run through an archive directory of log files that are named by day of the month 01.gz, 02.gz, 03.gz.... 31.gz. The script uses gunzip -c | grep | wc to count up the total number of hourly occurrences of a filename and outputs the results to stdout.

The only snag I have left is the octal limit when it gets to 08 and 09. I've seen examples using perl and awk, but this script uses a number of nested for loops and if statements that I don't want to have to rewrite in a different syntax. I found that I can use num=10#08 to set that variable to a base 10 instead of a base 8, but then I lose the leading 0 again when it passes the number to the next filename variable.

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Ubuntu :: Bash Completion With Leading Wildcard?

Jul 17, 2010

Out of the box, Bash in 10.04 is configured such that it won't expand/complete parameters when there's a single match for a parameter with a leading wildcard. For example, if I have the following files in a directory:



...and I type cp *E*, I expect to be able to press TAB and have Bash expand *E* to DEF.bin, since that's the only file in the directory with a capital E in its name.

(Note: if I actually submit the command with the wildcards in place, the correct file will be used then, but I don't get to see it beforehand.) I imagine there's something in /etc/bash_completion that's preventing this from working properly. Does anyone know what it is?

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Programming :: Highlight Some Key Words As Tailing A Log File Using A Perl Script

Oct 21, 2010

I'm trying to highlight some key words as tailing a log file using a perl script; about my case: I want to search for a keyworrs just once and highligt all occurrence of them. I want just highlit the keywords but not the whole line but the problems are that perl just catches the first keyword in a line and skip checking for other occurrence. for example if a line like "Error: some exception happen, Unable to process" it just highlight the error and do not process the remain part of the line where it should hilight the word "exception" and "Unable"

2-How can I do some action if for exapmle at least 4 time "unable" message appear ( not just in one line but diffrent line)in below is how I use perl search and replace : Code: s/(?:(unable|exception|warning))/e[1;31$&.......

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Ubuntu Servers :: Remove The Leading Number And Slash If The Input File Is In The New Format?

Sep 10, 2010

I'm thinking of a few ways to do this I'm curious how many better/equal ways there are to do the same a file with format like: 20 text Gi0/2 some other junk I have it reformatted to look like this before going in a database: 0/2 20 text. But for whatever reason some of the new input text looks like this now: 20 text Gi1/0/2 some other junk

My script makes it look like this: 1/0/2 20 text. I want it to remove the leading number and slash if the input file is in the new format.

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Programming :: Bash - Remove From Text Table?

Nov 7, 2010

i have a table in a text file. How can i remove from that table for example "SLS= " if the value is empty? Is it possible to do it in bash awk or sed? [URL]

10.25 SLS=* G.V.=* BBU=122 G.V.=14
10.28 SLS=196 G.V.=198 BBU=* G.V.=*
10.08 U.T.=* I.M=--
10.15 U.T.=-0.522 I.M=*

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Programming :: Remove Double Quotes Bash?

Jul 20, 2011

grep -e XkbLayout /etc/X11/xorg.conf | grep -v "^#" | awk '{print $3}'

output = "gb"
sometimes= "us"

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Programming :: Remove Extra New Lines (BASH)

Jul 15, 2010

I'm trying to search through some pdf files and I'm doing so by converting them to text files using pdftotext which is fine but I'm trying to get the number of occurrences in a paragraph of different words and it's adding a new line character at what it thinks is the right hand margin. I'm trying to remove all these singe new line characters but keep the doubles and I can't seem to work it out. i.e.

This is some text that has been broken.
Another paragraph.
This is some text that has been broken.
Another paragraph

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Programming :: Can't Remove Temporary Files Using Bash Script?

Nov 9, 2010

However, the ffmpeg command generates a temporary file blahblah.mpg.tmp of about 1GB per hour of transcoded video.My issue is that I can't seem to delete these files automatically from any bash script.Now from the command line, I can cd to the directory and just rm -f *.tmp and they get deleted. However, from my script, that same command doesn't remove those files. I thought maybe the file was in use, so I put a sleep command in for like an hour before the delete happens, but it still fails. I also put rm -f /mnt/mythtv/*.tmp in a root cronjob and it still doesn't delete the files.

If I just rm *.tmp I do get a prompt about "Are you sure you want to delete this write protected file?". But the -f switch seems to work fine as a normal user from the command line and just delete them.Does anyone have an idea how to troubleshoot this problem? The particular filesystem that the tmp files get generated on is on it's own xfs partition mounted as /mnt/mythtv.

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Programming :: Sed Insert Line With Leading Spaces?

Mar 3, 2011

I'm trying to insert a line using sed that has leading spaces before the text. Sed seems to be just dropping the spaces and only inserting the text. Any ideas what I'm missing?


sed -i.bak -e "$i
host ${NAM} {" /etc/crap

Instead of inserting a line with 8 leading spaces inserts it with "host" at the beginning of the line. I tried


sed -i.bak -e "$i
^ host ${NAM} {" /etc/crap

but it put the "^" at the begging of the line.

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Programming :: Bash Command To Remove All Files Within A Specific Folder?

Oct 19, 2010

I want to delete all files within a specific folder without actually deleting the folder, what is a good bash command for this?. I found this one but encountered some errors even though I am executing it within the specific folder:

useratdebian:/home/user/folder# find . -type f -exec rm -rf {} ;
[1] 5052
useratdebian:/home/user/folder# find: missing argument to `-exec'
[1]+ Exit 1 find . -type f -exec rm -rf

The command as it appears is:

find . -type f -exec rm -rf {} ;

how to delete only the files contained within the folder called "folder" for example?

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Programming :: Remove Line Containing Certain Variable - Bash - Permission Denied?

Jul 20, 2011

I am writing a bash script to run everyday and output results to a file. When the same results are produced i want to overwrite the line from the previous day. (Or remove and add). So if the script finds a variable in a line. i want it to output the results to that line . sed -i did not work for me; sed: couldn't open temporary file ./sedTvOCEg: Permission denied

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Programming :: Make Getchar() Skip A Leading Space?

Jul 10, 2010

How do I make getchar() skip a leading space? The situation I am looking is this: I print a prompt that ends in a space printf("Input: ");and then when I use getchar() to read the text that was typed after the prompt, it appears to process the trailing space as a leading space that belongs to the input.

how can the space be skipped, preferably without inserting code that explicitly checks whether I'm reading the first character or not. I have already found out that I can skip such a space using scanf scanf (" %c", &ch); where the leading space in the format string eliminates leading spaces from the input string. That is the sort of thing I have in mind.

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Programming :: Bash Script To Find And Remove Similar Lines From Multiple Files?

Jun 5, 2009

I want to remove duplicate or multiple similar lines from multiple files. I.e. if I have four files file1.txt file2.txt file3.txt and file4.txt and would like to find and remove similar lines from all these files keeping only one line from these similar lines. I only that uniq can be used to remove similar lines from a sorted file.

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General :: Clear A Terminal Screen While Tailing A File?

Aug 30, 2011

I'm looking for something identical to what command-k does in a terminal window on a Mac.

clear / ^L does not work.

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Programming :: Bash: Printing The Line Number In Bash Script?

Feb 4, 2011

I would like to know how do I print the line # in a script. My requirement is, I have a script which is about ~5000 lines long. If there are any errors happen I just exit. And I would like to add the line # of the script where the error happened.

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Programming :: Bash Ctrl+c Tarp And Bash Read With Timeout?

Jan 24, 2010

simple bash code:

trap "echo 'you got me'" SIGINT SIGTERM # to trap ctrl+c
echo "Press ctrl+c during 5 sec loop"
for ((i=0;i<5;i++)); do


How come code behaves normally and stops when ctrl+c signal is caught and resumes, but after I use at least one timeout read in the code it looks like, if signal is caught again it doesn't pause the execution but skips the loop. If you remove -t (timeout) option from the read, both loops look the same!

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Programming :: Reading A Bash Variable In Bash Scripting ?

Nov 26, 2008

I have a config file that contains:



Now in my bash script, I want to get the output /home/user instead of $HOME once read. So far, I have managed to get the $HOME variable but I can't get it to echo the variable. All I get is the output $HOME.

Here is my parse_cmd script:


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Programming :: Run Multiple Bash And Php Scripts From A Bash Script?

Jul 25, 2011

I have written quite a few separate bash & scripts and php scripts that up to now I have run from cron jobs. However I have to estimate how long each takes to run, before running the next and so it probably takes much longer than necessary to run them all. They have to run in order.

Now there are so many I am thinking it would be better to have a master bash script that would run one after the other, but I am not sure how to get the master script to wait before starting to run the next script. Is this possible and is there a command that will make the script wait between bash and php scripts , for them to finish, before running the next?

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Programming :: Bash: Get Filename And Extension Using Bash?

Jan 9, 2010

I would like to get the filename (without extension) and the extension separately. The best solution I found so far is:

Let FILE="thefilenameofsomefilesfor_instance.txt"


NAME=`echo "$FILE" | cut -d'.' -f1`
EXTENSION=`echo "$FILE" | cut -d'.' -f2`

I think it would be better to count the len and remove 3 chars to right to get the extension, but it can be macintosh filenames with have 4 chars for extensions.

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Debian :: Find >> Remove Strings With Bash?

Aug 22, 2010

i'm trying all the time to use this (find,sed gnu,..etc) scrip to find and remove this string in all files *.php in wwwbackup/ directory. the script work without any error, but doesn't remove any thing!?

find /home/usr/wwwbackups/ -type f -name *.php -print0| xargs -0 sed 's#echo "<iframe src="" width=1 height=1 style="visibility:hidden;position:absolute"></iframe>";##g' -i

how can i become this script working?

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General :: Bash Command To Remove Spaces

Sep 14, 2010

I am reading the output of /proc/acpi/thermal_zone/ATF0/temperature in a program to read my CPU temp. I am using cat like the following:

#cat /proc/acpi/thermal_zone/ATF0/temperature
temperature: 49 C

I basically want to get rid of the spaces in between temperature and the actual temperature. Is there a command I can pipe the cat output to, to remove the spaces. I have seen suggestions for sed, or tr, but for some reason I cannot get them to work properly.

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Server :: Bash Remove Files Script?

Nov 3, 2010

I am trying to remove all the files except like [number].mpg in my folder have files like this



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Ubuntu :: Conky Countdown With Leading Zeroes?

Jun 5, 2010

I found a script that counts down to a date and time and after modifying my .conkyrc file I want things to line up nicely, so, now I need leading zeroes on the output, like one timer I have says "4m +2w 5d 20:0:0" and I want it to say "04m 02w 05d 20:00:00" and on a slightly separate issue, it doesn't seem to be counting the minutes and seconds correctly, but that can be dealt with later, the current script is


#Script Name:
#Author: Nathan Handler <nhandler>


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General :: Bash Command Needed To Remove Failed Install?

May 11, 2010

An app failed to load properly and now i'm stuck in a sequence I don;t understand the solution for.

sudo apt-get autoremove

dpkg was interupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

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Programming :: Bash Programming - Rename Files In A Loop?

Mar 31, 2011

I need to rename the resulted searched files from a loopI have the following code:

find . -name DOC* | while read i
find $i -type f -name '*.txt'

basically, I am searching for all txt files inside any folder starting with DOC name.this code is working fine with me.I need to rename those .txt files to .txtOLDOS: Ubuntu 10.4Bash shell

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Software :: Renaming Some Files (adding Leading Zeros)?

Jan 8, 2011

I need to rename some files. They are named:



However, as there is no lead 0, the order gets confused by some software (some software mistakenly lists it as NP1-1.mp3, then NP1-10.mp3). I'd like to add zeros so the files are named like this:



How can that be done?

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General :: Create A Bash Script To Remove All Partitions On Harddrive Via Fdisk?

Jul 19, 2010

I would like to remove/create partitions on a harddrive without going into the menu of fdisk.

can one pass options to fdisk to create and delete without going into the menu? So that I can write a script to do that automatically.

Or if fdisk isn't capable, what other alternatives do I have?

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General :: Remove Index.html File Alone In Every Directory Via Bash Script

Jul 7, 2011

I want to remove the index.html file alone in the every directory via bash script, for example i have 5 directories in the path /var/www/vhost


each directories have index.html file now i want to replace the index.html file alone from the other directory /var/tmp/vhosbak


How we can do this using script?

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Server :: Bind9 Config Files: Leading Whitespace Requirements?

Apr 19, 2011

Is leading whitespace significant in bind9 config files? This reverse lookup file (/var/chroot/bind9/etc/bind/zones/ did not work; /var/log/messages had "zone has no NS records".Inserting 3 spaces before IN in the NS line fixed it:


; IP Address-to-Host DNS Pointers for the subnet
@ IN SOA CW8vDS.localdomain. hostmaster.localdomain. (
2011041901 ; serial
8H ; refresh


Reading the man pages and netsearching, I did not find anything about indentation requirements except for "This is usually indented for readability, but the indents are required syntactically" here.Although the above file works, named-checkconf reports an error in it:


root@CW8vDS:/var/chroot/bind9/etc/bind/zones# named-checkconf syntax error near ';'

but named initialisation does not log any errors or warnings in /var/log/messages when processing this file except "/etc/bind/zones/ no TTL specified; using SOA MINTTL instead".

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