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• cd Terminal at a given directory after running a Python script?

  - by Dave Everitt

  I'm working on a simple Python script that can use subprocess and/or os to execute some commands, which is working fine. However, when the script exits I'd like to cd the actual Terminal (in this case OS X) so on exit, the new files are ready to use in the directory where the have been created. All the following (subprocess.Popen, os.system, os.chdir) can do what I want from within the script (i.e. they execute stuff in the target directory) but on exit leave the Terminal at the script's own directory, not the target directory. I'd like to avoid writing a shell script to temporary file just to achieve this, if this is at all possible anyway?

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• Need help with shell script

  - by via-point

  I am a total newbie to Shell Scripting so please bear with me. I need to create a shell script called script1 that will calculate and then display letter grade of ABC2345. Read in the following grades from keyboard: Assignments 40% Test1 15% Test2 15% Final exam 30% Calculate and display the number grade using the weight of each factor above Convert the number grade to letter grade using the table below: Number Grade Letter Grade 90 - 100 A+ 85 - 89 A 80 - 84 77 - 79 B+ 73 - 76 B 70 - 72 B- 67 - 69 C+ 63 - 66 C 60 - 62 C- 57 - 59 D+ 53 - 56 D 50 - 52 D- 0 - 49 F Any help would be appreciated :) Thank you!

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• recursive directory svn move shell script

  - by yaya3

  I want to rename all nested directories named "foo" to "bar" - I've tried the following with no joy: find */ -name 'foo' | xargs svn move {} 'bar' \; Thanks

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• Give the mount point of a path

  - by Charles Stewart

  The following, very non-robust shell code will give the mount point of $path: (for i in $(df|cut -c 63-99); do case $path in $i*) echo $i;; esac; done) | tail -n 1 Is there a better way to do this? Postscript This script is really awful, but has the redeeming quality that it Works On My Systems. Note that several mount points may be prefixes of $path. Examples On a Linux system: cas@txtproof:~$ path=/sys/block/hda1 cas@txtproof:~$ for i in $(df -a|cut -c 57-99); do case $path in $i*) echo $i;; esac; done| tail -1 /sys On a Mac osx system cas local$ path=/dev/fd/0 cas local$ for i in $(df -a|cut -c 63-99); do case $path in $i*) echo $i;; esac; done| tail -1 /dev Note the need to vary cut's parameters, because of the way df's output differs: indeed, awk is better. Answer It looks like munging tabular output is the only way within the shell, but df /dev/fd/impossible | tail -1 | awk '{ print $NF}' is a big improvement on what I had. Note two differences in semantics: firstly, df $path insists that $path names an existing file, the script I had above doesn't care; secondly, there are no worries about dereferncing symlinks. It's not difficult to write Python code to do the job.

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• how to read rows?

  - by lego69

  I'm trying to read first row from the file > source ./rank file using this script set line = ($<) but when I enter echo $line I receive nothing, how can I change it? thanks in advance

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• How can I quickly sum all numbers in a file?

  - by Mark Roberts

  I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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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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• Find all writable files in the current directory

  - by Andrei

  I want to quickly identify all writable files in the directory. What is the quick way to do it?

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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 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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• 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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• 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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• 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 does < < mean in the shell

  - by stib

  when looping recursively through folders with files containing spaces the shell script I use is of this form, copied from the internet: while IFS= read -r -d $'\0' file; do dosomethingwith "$file" # do something with each file done < <(find /bar -name *foo* -print0) I think I understand he IFS bit, but I don't understand what the < < characters mean. Obviously there's some sort of piping going on here.. It's very hard to google "< <", you see. TIA -stib

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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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• Socket left in TIME_WAIT after file transfer via netcat

  - by com

  Using Copying by NetCat I am trying to copy files throught network by NetCat. From console it work pretty well. First I run listening netcat on the destination machine and after I run sending on source machine. The problem is it's doen't work from script from the source machine: ssh -f user@$desthost 'nc -l 1234 | tar xvf - /dev/null &' #listening on destination host tar cv /tmp/file | nc $desthost 1234 #sending to destination host I saw that after running port 1234 is still was open and status of the socket was TIME_WAIT. If you know what's the problem, please, help me out. And by the way, after copying how can I validate that the content is identical? Thanks! Addendum: I found one very strange thing, the same implementation with screen on destination work works, but not stable, sometimes it doesn't copy a file. ssh user@$desthost screen -dm -S test 'nc -l 1234 | tar xvf - ' #listening on destination host Maybe there is an issue with timeout?

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• Shell script variable problem

  - by user280288

  Hi all, I'm trying to write a shell script to automate a job for me. But i'm currently stuck. Here's the problem : I have a variable named var1 (a decreasing number from 25 to 0 and another variable named var${var1} and this equals to some string. then when i try to call var${var1} in anywhere in script via echo it fails. I have tried $[var$var1], ${var$var} and many others but everytime it fails and gives the value of var1 or says operand expected error. Thanks for your help

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• What is the difference between $@ and $* in shell scripts ?

  - by Julien Nicoulaud

  In shell scripts, what is the difference between $@ and $* ? Which one is the preferred way to get the script arguments ? Are there differences between the different shell interpreters about this ?

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• Linux script to kill process listening on a particular port

  - by Evgeny

  I have a process that listens on a TCP port (?0003). From time to time it crashes - badly. It stops working, but continues hogging the port for some time, so I can't even restart it. I'm looking to automate this. What I do right now is: netstat -ntlp |grep -P "\*\:\d0003" To see what the PID is and then: kill -9 <pid> Does anyone have a script (or EXE for that matter) that would link the two steps together, ie. parse the PID from the first command and pass it to the second?

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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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• 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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• 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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