AWK is a text-processing language. It is mainly used to manipulate and process structured data, and to generate reports.

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Convert an ascii character to ascii hexadecimal representation

How do I convert an ASCII char to ASCII HEX in a AWK script? I want loop by a range of letter example for(i="a"; i<"g"; i++) print i; NOTE: I want loop by a range from hex representation and ...
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2answers
332 views

Why is awk printing this line more than once?

I have the following ldif: dn: cn=Robert Smith,ou=people,dc=example,dc=com objectclass: inetOrgPerson cn: Robert Smith cn: Robert J Smith cn: bob smith sn: smith uid: rjsmith userpassword: rJsmitH ...
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5k views

How can I identify non-ASCII characters from the shell?

Is there a simple way to print all non-ASCII characters and the line numbers on which they occur in a file using a command line utility such as grep, awk, perl, etc? I want to change the encoding of ...
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1answer
321 views

ping|awk not responsive

While trying melodyping, I noticed that ping <host> |awk '{print $1}' takes about 30 seconds until the first line is actually displayed. Even though w/o piping to awk each ping is returned in ...
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2answers
180 views

Generate new file with specific structure from text file

On Linux I have the file orig-file.txt. This file include 4 fields now, but they could be less or more (this file is generated by other application). What is the best option to translate the ...
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2k views

Parsing out specific URLs from local html file

I want to parse out certain URLs from a saved html-file with a simple bash-script/command, so i can download them via wget laters. What i have so far is: awk 'BEGIN{ RS="<a *href *= *\""} NR>2 ...
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111 views

Generate a files list and truncate it in 2 list of X Mb of files each

I need to generate a list of all files in a certain dir, and truncate it in X lists containing each one a fixed amount of data of files. E.g. I have 95 Gb of data. generate the file list ...
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1answer
892 views

Output high CPU processes using bash shell

I am trying to monitor my CentOS processes using top command to see if there are any processes where CPU usage is greater than X%, below is the command I am using to see if any processes CPU usage is ...
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30 views

Looking for a command that will return the proc, func, etc that uses another proc, func, etc

Grep-ing for a function name to see where it's being used returns a list of rows and row numbers. Is there a smart way of using grep and awk to get the name of the calling procedure instead? Thanks
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Print back-reference in regular expression

I was hoping for a way to make sed replace the entire line with the replacement (rather than just the match) so I could do something like this: sed -e "/$some_complex_regex_with_a_backref/\1/" and ...
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998 views

Inserting string from xargs into another string

Say I have some command that outputs a bunch of strings. The output from this command could look something like: ... foo bar blargh ... Say I have some set string myString$Blah I want to insert ...
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1answer
5k views

Extract substring before = sign using awk

Say I have some file with a bunch of lines in the form someString=someMoreCharacters anotherString.blah=foo=bar blah.blah.blah=foo.bar.=foobar Desired output someString anotherString.blah ...
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6answers
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Pipe output of awk to kill -9

I'm trying to kill any process that has to do with mysql. I'm piecing together a command, and so far, haven't come up with the right solution. One other consideration, is that the last process will ...
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3answers
1k views

Get LVM size using AWK?

I'm in need to find out the LVM size of image vm001. Let's say I have a LVM volume called /dev/VGgroup/vm001. Now using lvdisplay I can find out the size: --- Logical volume --- LV Name ...
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4answers
3k views

How to remove lines from large text file using bash

I got a huge text file (log file) in my CentOS which I would like to remove top part of, probably couple of thousand lines each day. (Or probably just split into two) I have search this site and ...
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3answers
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how to limit find command's output used with option -print0

I'd like to limit output of find command. In the past I used to use for this ls command, e.g: ls *tgz|head -100|xargs -i mv "{}" ../ but I got to know that the result may be unpredictable if name ...
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2answers
3k views

Is it possible to change the default field separator in awk?

I'm always using awk to manipulate comma separated files, so the first line in my code is always changing the field separator to "," like so: awk 'BEGIN {FS=","} $2 < 20 {print $1}' myfile.csv ...
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1answer
268 views

awk: equivalent of mysql's “\G” to print tabulated data in multiple lines

Is there an equivalent to mysql's "\G" at the end of the query but awk (or similar) that will to print tabulated data from a text file in multiple lines with the header next to it? Something that will ...
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3answers
496 views

Oneliner for multiline regex s/,\n]/]/g?

Can someone provide a simple one-liner to remove certain line breaks? In vim I use %s/,\n]/]/g This should be possible with a very simple one-liner IMHO, but how?
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0answers
187 views

How can I improve or wrap my sed-script?

I instrumented a mvn build to emit profiling data, which I want to analyse later on. Therefore, I made the sed script below, to generate json-data from the profilers output. I call the script with ...
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1answer
241 views

how to redirect output of command line execution to more than one file according to weight of output

Currently I'm using an awk line to filter a set of files according to certain criteria. How can I redirect the result output to more than one file if the result, for example if the file that would ...
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2answers
480 views

Awk responds differently based on how an empty argument is specified

I seem to have stumbled on something which is probably a bug in awk, but it could also be a bug in my understanding of bash/awk. I was trying to debug issues where the output of a python program was ...
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1answer
351 views

usermod + awk invalid syntax

I have been trying to write a command (Solaris server) that adds a user to a specific group. It's a pretty long command so I'll post the whole command here and then break it down. USER=myUser ...
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Removing ANSI color codes from text stream

Examining the output from perl -e 'use Term::ANSIColor; print color "white"; print "ABC\n"; print color "reset";' in a text editor (e.g., vi) shows the following: ^[[37mABC ^[[0m How would one ...
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288 views

awk + sed + match complex string

I need useful command to match the string "/pci.../pci.../pci..../scsi..../disk..." with awk or sed? ( I need to put this command in my ksh script ) remark 1 [...] can be any string , and “pci pci ...
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How to pipe awk output (with periodic, continuous input) to output file?

I am trying to write a command that pipes the continuous output of a free command (run every second) to an awk command that parses a specific value (available free memory) and outputs this to a file ...
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1answer
5k views

“No such file or directory” for /bin/awk on Ubuntu

How can I install awk in this version of Ubuntu 11? I installed it from Ubuntu Software Center and I cannot use it. I'm trying to run an awk script: #!/bin/awk Begin { print strftime("ora ...
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167 views

How to reconnect a screen session every time terminal is fired?

I wrote this command to reconnect an active screen session when Terminator is opened. It works find but there has got to be a better way to to it This is goes in the Terminator config file (note ...
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441 views

How to pass bash variables (passwords) to IRSSI config file?

I'm using IRSSI and I wonder how can I pass my IRC channel's passwords to the IRSSI config file (~/.irssi/config) without writing them directly in the file. In Mutt I've an awk command that queries a ...
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2answers
394 views

What's the best command to use to change a timestamp to readable date when 'tail -f'-ing a log file?

I have a program which logs like this: 1324218770.7644 INFO etc What's the best Linux shell program to pipe that through to change the timestamps to a human readable format like Sun 18 Dec 2011 ...
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how to write `awk here document`

I have a bash script: #!/bin/bash gawk -f realmap.awk realmap.log | column -ts: > realmap.csv gnuplot <<-_EOF_ set term png set out 'realmap.png' set xlabel 'index' set ...
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726 views

How to solve “Broken Pipe” error when using awk with head

I'm getting broken pipe errors from a command that does something like: ls -tr1 /a/path | awk -F '\n' -vpath=/prepend/path/ '{print path$1}' | head -n 50 Essentially I want to list (with absolute ...
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2answers
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awk match whole word

I want to use awk to match whole words from text file. Including words bounded by non alphanumeric characters. For example - string to search for - ABC Source file - HHHABCCCCH HHH ABC ...
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2answers
755 views

File name with spaces piped to two xargs commands

I have a directory and many more subdirectories like the following - file with spaces.txt filewithsuperlonglines.txt ordinaryfile.txt binaryfile.bin The command - find . -type f -print0 | ...
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1answer
807 views

“find | grep | awk” fails miserabily

I'm scanning for all shell scripts on my server, and are doing this by the following command: find / -type f -exec file --mime-type {} \; | grep "text/x-shellscript" This is working fine, and here ...
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4answers
3k views

Use variables in awk substr function

All, I have a string from which I want to extract a substring. The thing is that the starting position is stored in variable. AWK Doesn't seem to recognize the variable. Here is the code str="This ...
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2answers
192 views

determine start of file when passing multipe files to awk

I have a shell script like the following - find "." "Account" -maxdepth 1 -name "*.aspx" | xargs awk -f get_controls.awk It passes multiple files to an awk script BEGIN{ FS="\"" } ... ...
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1answer
959 views

How do I sort the “/etc/passwd” UIDs?

I have been banging my head on this little project the past few days and here is how it goes... I need to organize all the UIDs for multiple servers so all users have the same UID in their ...
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2answers
1k views

Unix one-liner to quote all words on a line

I have a text file which has lines consisting of words (separated by spaces) and I want to put quotes around all of the words. For example: Lorem ipsum dolor sit amet consectetur adipisicing ...
2
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2answers
741 views

Join two lines with awk or sed

If I have: foo bar ..and I'd like to awk/sed this to: foo-bar ..what's the syntax? I'm trying to use System Profiler on OS X 10.6.x: system_profiler SPMemoryDataType | awk '/Type/ {print $2} ...
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1answer
247 views

AWK CSV stream editing, merge third columns for identical first columns when second column >= 0

I'm on Windows and have only heard of linuxes awk etc so I can only imagine that this is possible without actual scripting: I have data like .. 162 42 A single serving 162 62 of ...
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3answers
450 views

SW to replace a string in Windows

I have a text file (actually XML) that I want to be able to change using a command line. In other words, as part of a Windows batch, I want to locate a string (in this case @@@@, which uses a ...
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2answers
958 views

Truncate all files in a directory after underscore?

I have a directory with a couple thousand images in it. Most of them have sensible filenames like SD-000.tif SD-001.tif BX-000.tif etc... However probably ~25% of them have names like BX-003_old.tif ...
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2answers
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Shell: Find and replace word

I have a string in my shell script which is in a fixed format : '[STATUS REPORT] PROJECT'. When user executes my shell script he will be asked to provide a value for 'PROJECT'. I would like to ...
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137 views

lines identical except for their first word, put the first word in a variable

I have file(sudoers) in which lines can be identical except for the first word in them (different users can execute the same set of commands). I am able to extract such a line using the command: # ...
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1answer
961 views

Getting the week number based on date with different first day of the week in gawk

How to get the week number in linux using gawk with different first day of the week? the date command can give me the week number with +%V but it is based on Monday (1-53) or +%U (based on Sunday, ...
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1answer
432 views

awk + find hostname after strings

please advice how to print the hostname ( NODE100 ) from the tnsnames.ora file by awk or sed I mean I want to get each hostname after "HOST =" or "HOST=" or "HOST =" etc thx ...
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550 views

Sort multiple files with bash

I have a question that involves the bash scripting language. I have multiple directories /studentName /studentMail /studentNumber In each of these directories is a file name.txt, mail.txt, ...
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1answer
111 views

why can awk function called without parentheses

Is print a function or statement. Why parentheses are not required? I couldn't find any information about this topic.
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1answer
697 views

how to move around files using “ls -al” result in Linux?

How can I write a script to copy files from one directory to another directory according to last modified date? ls -al -rw-r--r-- 1 user user 100 2011-05-26 12:33 ...