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• How to pass a variable to an awk print parameter...

  - by Jamie

  I'm trying extract the nth + 1 and nth + 3 columns from a file. This is what tried, which is a useful pseudo code: for i in {1..100} ; do awk -F "," " { printf \"%3d, %12.3f, %12.3f\\n\", \$1, \$($i+1), \$($i+3) } " All_Runs.csv > Run-$i.csv which, obviously doesn't work (but it seemed reasonable to hope). How can I do this?

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• How to generate changelog: git log since last Hudson build?

  - by takeshin

  I'm using Phing to do post build tasks in Hudson. I want to generate changelog containing all commits since last successful Hudson build. But looks like neither Hudson nor Git plugin for Hudson does not provide %last_build_time% variable. This would be satisfying solution, (but how to get the time?): git log --pretty="%s" --since="%last_build_time%" The only way I see for now is extracting it from the job xml file, but I do not know if it is possible with Phing. How do you generate your change logs?

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• remsh rsh error redirect problem

  - by soField

  using following command on hp-ux remsh opera -l myuser crontab -l /opt1/exp_opera_crontab 2/opt/a.log and when i echo $? i get 0 because its executing crontab -l on remote machine but i dont have opt1 directory so export wont be copied to my local machine in /opt1/exp_opera_crontab i dont get any error about this when i run this remsh or rsh command is there any way to identify both of remote and local machine related errors and redirecting them into my local machine ?

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• How to order a ls output by suffix?

  - by Luca Borrione

  Having a ls output like GGGG_3.0.3_98/ GGGG_3.0.3_d_100/ GGGG_3.0.3_d_101/ GGGG_3.0.3_d_99/ GGGG_3.0.4_104/ GGGG_3.0.4_105/ GGGG_3.0.4_106/ GGGG_3.0_87/ GGGG_3.0_89/ GGGG_3.0_90/ GGGG_3.0_91/ GGGG_3.0_92/ GGGG_3.0_93/ SSS_2.2.3_01/ SSS_2.2.3_02/ SSS_2.2.3_03/ TTT_2.8.3_29/ how to get the elements ordered by suffix? Also, is there any quick command I can use to know that 106 is the last suffix in this example? Sorry: it wasn't clear that "the suffix" in the given example is everything following the final underscore.

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• Finding missing files by checksum

  - by grw

  Hi there, I'm doing a large data migration between two file systems (let's call them F1 and F2) on a Linux system which will necessarily involve copying the data verbatim into a differently-structured hierarchy on F2 and changing the file names. I'd like to write a script to generate a list of files which are in F1 but not in F2, i.e. the ones which weren't copied by the migration script into the new hierarchy, so that I can go back and migrate them manually. Unfortunately for reasons not worth going into, the migration script can't be modified to list files that it doesn't migrate. My question differs from this previously answered one because of the fact that I cannot rely on filenames as a comparison. I know the basic outline of the process would be: Generate a list of checksums for all files, recursing through F1 Do the same for F2 Compare the lists and generate a negative intersection of the checksums, ignoring the file names, to find files which are in F1 but not in F2. I'm kind of stuck getting past that stage, so I'd appreciate any pointers on which tools to use. I think I need to use the 'comm' command to compare the list of file checksums, but since md5sum, sha512sum and the like put the file name next to the checksum, I can't see a way to get it to bring me a useful comparison. Maybe awk is the way to go? I'm using Red Hat Enterprise Linux 5.x. Thanks.

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• Add zip files from one archive to another using command line

  - by Curious2learn

  I have two zip archives. Say, set1 has 10 csv files created using Mac OS X 10.5.8 compress option, and set2 has 4 csv files similarly created. I want to take the 4 files from zipped archive set2 and add them to list of files in archive set1. Is there a way I can do that? I tried the following in Terminal: zip set1.zip set2.zip This adds the whole archive set2.zip to set1.zip, i.e., in set1.zip now I have: file1.csv, file2.csv,..., file10.csv, set2.zip What I instead want is: file1.csv, file2.csv,..., file10.csv, file11.csv, ..., file14.csv where, set2.zip is the archive containing file11.csv, ..., file14.csv. Thanks.

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• What is this project/compilation source structure?

  - by Werner

  Hi, I am working on some project my boss sent to me. After unzipping, this is the structure of the files: executable_file config.mk doc include lib Makefile sources I have only worked with "usual" Makefile projects. But I do not undersatnd the meaning of config.mk here. Do you know which kind of "build" structure (what is the right name for this concept?) is it, and where can i find more information about this? I need to modify it, so it compiles in another hardware, so I do not know where I sohuld work on. Thanks

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• How do I can linux flock command to prevent another root process deleting a file?

  - by Danmaxis

  Hello there, I would like to prevent one of my root process from deleting a certaing file. So I came across the flock command, it seems to fit my need, but I didnt get its sintax. If I only indicate a shared lock, it doesnt work: flock -s "./file.xml" If I add a timeout parameter, it still doesnt work flock -s -w5 "./file.xml" It seems that way, it fits in flock [-sxun][-w #] fd# way. (What is this fd# parameter?) So, I tried the flock [-sxon][-w #] file [-c] command Using flock -s -w5 "./file.xml" -c "tail -3 ./file.xml" and it worked, tail command at ./file.xml was executed. But I would like to know, does the lock end after the command or does it last 5 seconds after the end of the command execution? My main question is, how can I prevent another root process deleting a file in linux?

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• How to start a Python ipython shell, automatically run inside it a few commands, and leave it open?

  - by Gj

  I tried echo "print 'hello'" | ipython Which runs the command but ipython immediately exits afterwards. Any ideas? Thanks!

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• List and Remove directories in an archive

  - by Tim

  I wonder how to list the content and remove some directories in an archive file? For example, I have an archive file data.tar. I would like to list its content without extracting it. I also would like to remove some directories inside it matching "*/count1000" Thanks and regards!

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• join 3 files by first Column with awk ?

  - by noinflection

  i have three similar files, they are all like this: File A ID1 Value1a ID2 Value2a . . . IDN Value2n and i want an output like this Output ID1 Value1a Value1b Value1c ID2 Value2a Value2b Value2c ..... IDN ValueNa ValueNb ValueNc Looking to the first line, i want value1A to be the value of id1 in fileA, value1B the value of id1 in fileB, and so on which each field and each line. I thougth it like a sql join. I've tried several things but none of them where even close.

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• How to get the call graph of a program and with a bit of profiling information

  - by Werner

  Hi, I want to understand how a C++ program that was given to me works, and where does it spend the most of the time. For that I tried to user first gprof and then gprof2dot to get the pictures, but the results are sometimes kind of ugly. I wonder if could recommend me other alternatives or how do you usually do this. Thanks

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• Appending rather than overwriting files when moving

  - by ukas1

  I have the following directory structure: +-archive +-a +-data.txt +-b +-data.txt +-incoming +-a +-data.txt +-c +-data.txt How do I do the equivalent of mv incoming/* archive/ but have the contents of the files in incoming appended to those in archive rather than overwrite them?

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• Using /dev/tcp instead of wget

  - by User1

  Why does this work: exec 3</dev/tcp/www.google.com/80 echo -e "GET / HTTP/1.1\n\n"&3 cat <&3 And this fail: echo -e "GET / HTTP/1.1\n\n" /dev/tcp/www.google.com/80 cat </dev/tcp/www.google.com/80 Is there a way to do it in one-line w/o using wget, curl, or some other library?

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• Delete lines containing a range pattern in 4rd columns

  - by Andrei

  In a file 4th column contains a floating point numbers dsfsd sdfsd sdfds 4.5 dfsdfsd I want to delete the entire line if the number between -0.1 and 0.1 (or some other range). Can sed or awk do that for me? thanks

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• Is there a way to find a specific file and then change into the directory containing it in one go?

  - by bergyman

  I'm looking for a way to find what I know will be a unique file, and then change into the directory containing that file. Something along the lines of: find . -name 'Subscription.java' | xargs cd Or: find . -name 'Subscription.java' -exec cd {} \; I know this won't work because it's both trying to cd supplying the entire absolute path, which contains the file, and also because xargs can't do any built in shell commands...but you get the point of what I want to accomplish.

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• how can I split up this string

  - by lacrosse1991

  I am currently trying to sanitize some log files so they are in an easier format to read, and have been trying to use the gnu cut command, which works fairly well, although I cannot really think of a good way to remove the [INFO] part of the string logs/logs/server_1283258036.log:2010-08-31 23:06:51 [INFO] <NateMar> where?! logs/logs/server_1281904775.log:2010-08-15 22:59:53 [INFO] <BoonTheMoon> §b<BoonTheMoon>§ohhhhhh I would ultimately want to get the strings down to something that resembles the following 2010-08-31 23:06:51 <NateMar> where?! 2010-08-15 22:59:53 <BoonTheMoon> ohhhhhh how should I go about doing this? Have thought about using awk, although Im having a difficult time getting a grip on how that would work, so not sure how to set up something to do that, any help would be greatly appreciated, thanks!

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• How can we execute linux commands from php programs??

  - by puspa

  I want to see output of the following code in the webbrowser: code: $var = system('fdisk -l'); echo "$var"; ? When i open this from web browser then no output in the web browser. So How can I do this?? Please help ! Thanks Puspa

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• xargs command works on ubuntu, but not mac

  - by Corey Hart

  I have the following line of code that I use to update my personal date variable in my projects to todays current date. This line works in Ubuntu's terminal, but the Mac terminal seems to be far behind. Unfortunately, I copied this snippet from some site, so I'm not sure how it exactly works. Suggestions? grep -ilr --exclude=revar.sh --exclude=README.md "[DATE]" * | grep -v .git | xargs -i@ sed -i "s/\[DATE\]/${today}/g" @

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• Maximum number of inodes in a directory?

  - by Dr. UNIX

  Is there a maximum number of inodes in a single directory? I have a directory of 2 million+ files and can't get an the ls command to work against that directory. So now I'm wondering if I've exceeded a limit on inodes in Linux. Is there a limit before a 2^64 numerical limit?

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• move file from one location to another in putty

  - by dexter

  i have created folder on my server (ie finesse)- 'home' in which i have several perl(.pl) files as tt.pl, re.pl etc. now i have created new folder in 'home' folder called 'perl' and want to move tt.pl and re.pl in perl folder is there any command to do so (like cut-paste in windows)? note: i am using putty 0.60 on windows xp

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• Folder Renaming After Tar Extraction

  - by Chris S

  I have an tarball, myarchive.tar.gz. When I uncompress it using "tar -zxvf myarchive.tar.gz", it creates a folder myarchive-x980-2303-ssioo. What's the easiest way to automatically rename the extracted folder to ensure it matches the name of the archive? I've checked tar's manpage, but it doesn't seem to have an option for this.

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• How to avoid escaping by accident in PERL using system()?

  - by Brian

  I want to run some commands using the system() command, I do this way: execute_command_error("trash-put '/home/$filename'"); Where execute_command_error will report if there was an error with whatever system command it ran. I know I could just unlink the file using Perl commands, but I want to delete stuff using trash-put as it's a type of recycling program. My problem is that $filename will sometimes have apostrophes, quotes, and other weird characters in it that mess up the system command or Perl itself.

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• Logging into SO with curl

  - by Good Person

  I'm working on a project and I want to log into SO via curl. I use an openid via Google which means that I need to log into Google first. Here is the code I have so far #!/usr/bin/env sh . ./params.sh #the file with username and password curl --silent https://www.google.com/accounts/ClientLogin \ -d Email=$username -d Passwd=$password \ -d accountType=GOOGLE \ -d source=localhost-test-1 \ -d service=lh2 \ -o tokens #get $Auth as a variable . ./tokens echo $Auth; How do I use the $Auth token to log into SO? edit: I found http://code.google.com/apis/gdata/articles/using_cURL.html and I'll post the updated code soon.

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• UNIX Programs (Shell Scripting) [closed]

  - by atif089

  Hi, I have an exam tomorrow and I need some help with these programs. Or if you can tell me where I can get these. Write a program which uses grep to search a file for a pattern and display search patterns on standard output Write an awk program to print only odd numbered lines of a file. Write a program to open the command ls and give the output to the command through which we count the number of files Thank You :)

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