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• execute command hard coded in script not work when its in a variable

  - by johnnycrash

  this works: nc shldvgfas005 6155 < temp.6153 this hangs: cmd="nc shldvgfas005 6153 < temp.6153"; $cmd this gives an error: cmd="nc shldvgfas005 6153 < temp.6153"; "$cmd" -bash: nc shldvgfas005 6153 < temp.6153: command not found HELP!

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• How to find out the exact RSS XML path of a website?

  - by Winston

  How do I get the exact feed.xml/rss.xml/atom.xml path of a website? For example, I supplied "http://www.example.com/news/today/this_is_a_news", but the rss is pointing to "http://www.example.com/rss/feed.xml", most modern browsers have this features already and I'm curious how did they get them. Can you cite an example code in ruby, python or bash?

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• How to set a default value in an IF snippet?

  - by kuti

  Hello, I have the following snippet in a bash script written in Solaris 10: printf "port(389)=" read PORT if [[ $PORT == "" ]]; then PORT=389 fi What I am trying to get that if the user hits the enter key, the Port should be set to 389. The snippet above does not seem to be working. Any suggestions?

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• Send a command to a process

  - by Montecristo

  Using bash, is it possibile to send the equivalent of a space bar stroke to a process? If so, how can that be done?

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• echo "-e" doesn't print anything

  - by wheleph

  I'm using GNU bash, version 3.00.15(1)-release (x86_64-redhat-linux-gnu). And this command: echo "-e" doesn't print anything. I guess this is because "-e" is one of a valid options of echo command because echo "-n" and echo "-E" (the other two options) also produce empty strings. The question is how to escape the sequence "-e" for echo to get the natural output ("-e").

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• Apply command to each line

  - by Alex

  Suppose I have some output from a command (such as ls -1): a b c d e ... I want to apply a command (say echo to each one, in turn). E.g. echo a echo b echo c echo d echo e ... What's the easiest way to do that in bash?

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• Flatten a java project directory structure prepending the path to the file.

  - by Fork

  Hi there, I am trying to write a script (preferably in bash) to flatten a java projet directory structure prepending the path to the file. Example: | src | org | apache | file2.java | file1.java would result in: | src | org|apache|file2.java | org|file1.java The script should be recursive since the directory could have many subfolders.

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• System loops using non-integers?

  - by mary

  I wrote a .sh file to compile and run a few programs for a homework assignment. I have a "for" loop in the script, but it won't work unless I use only integers: #!/bin/bash for (( i=10; i<=100000; i+=100)) do ./hw3_2_2 $i done The variable $i is an input for the program hw3_2_2, and I have non-integer values I'd like to use. How could I loop through running the code with a list of decimal numbers?

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• Binding on a port with netpipes/netcat

  - by mindas

  I am trying to write a simple bash script that is listening on a port and responding with a trivial HTTP response. My specific issue is that I am not sure if the port is available and in case of bind failure I fall back to next port until bind succeeds. So far to me the easiest way to achieve this was something like: for (( i=$PORT_BASE; i < $(($PORT_BASE+$PORT_RANGE)); i++ )) do if [ $DEBUG -eq 1 ] ; then echo trying to bind on $i fi /usr/bin/faucet $i --out --daemon echo test 2>/dev/null if [ $? -eq 0 ] ; then #success? port=$i if [ $DEBUG -eq 1 ] ; then echo "bound on port $port" fi break fi done Here I am using faucet from netpipes Ubuntu package. The problem with this is that if I simply print "test" to the output, curl complains about non-standard HTTP response (error code 18). That's fair enough as I don't print HTTP-compatible response. If I replace echo test with echo -ne "HTTP/1.0 200 OK\r\n\r\ntest", curl still complains: user@server:$ faucet 10020 --out --daemon echo -ne "HTTP/1.0 200 OK\r\n\r\ntest" ... user@client:$ curl ip.of.the.server:10020 curl: (56) Failure when receiving data from the peer I think the problem lies in how faucet is printing the response and handling the connection. For example if I do the server side in netcat, curl works fine: user@server:$ echo -ne "HTTP/1.0 200 OK\r\n\r\ntest\r\n" | nc -l 10020 ... user@client:$ curl ip.of.the.server:10020 test user@client:$ I would be more than happy to replace faucet with netcat in my main script, but the problem is that I want to spawn independent server process to be able to run client from the same base shell. faucet has a very handy --daemon parameter as it forks to background and I can use $? (exit status code) to check if bind succeeded. If I was to use netcat for a similar purpose, I would have to fork it using & and $? would not work. Does anybody know why faucet isn't responding correctly in this particular case and/or can suggest a solution to this problem. I am not married neither to faucet nor netcat but would like the solution to be implemented using bash or it's utilities (as opposed to write something in yet another scripting language, such as Perl or Python).

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• Remove trailing letters at the end of string

  - by wang

  I have some strings like below: ffffffffcfdeee^dddcdeffffffffdddcecffffc^cbcb^cb`cdaba`eeeeeefeba[NNZZcccYccaccBBBBBBBBBBBBBBBBBBBBBB eedeedffcc^bb^bccccbadddba^cc^e`eeedddda`deca_^^\```a```^b^`I^aa^bb^`_b\a^b```Y_\`b^`aba`cM[SS\ZY^BBB Each string MAY (or may not) end with a stretch of trailing "B" of varied length. I'm just wondering if we can simply use bash code to remove the "B" stretch? thx

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• Print each executed line in Python and Perl programs

  - by Vi

  I know that "bash -x script.sh" will execute script printing each line before actual execution. How to make perl and python interpreters do the same?

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• Launch an SWF full screen

  - by Geoff

  I have a swf file (a flash game). I want to run some script to open it in full-screen mode. I'm not attached to any browser, but I do run Linux, so a bash, or generic answer is what I'm looking for. I'm also open to building a lite browser application if need-be.

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• converting a csv into text

  - by user349418

  I have a csv (large) file of ip addresses, and wish to covert into single line ip address in bash. aa.bb.cc.dd,aa.bb.cc.dd,aa.bb.cc.dd,.. into aa.bb.cc.dd aa.bb.cc.dd aa.bb.cc.dd [..] The list of ips in question, http://www.stopforumspam.com/downloads/bannedips.zip

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• I need to cut a portion of a string in linux

  - by Abeed Salam

  I have a file in a folder like this: installer-x86_64-XXX.XX-diagnostic.run The XXX.XX is a version number and I need the version number only. How to do it in linux? I have this code: #!/bin/bash current_ver=$(find /mnt/builds/current -name '*.run'|awk -F/ '{print $NF}') So this gives me just the name of the file correctly (minus the location, which I dont want). But how do I only get the XXX.XX version number into a variable such as $version

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• grep pipe with sed

  - by 123Ex

  hi, This is my bash command grep -rl "System.out.print" Project1/ | xargs -I{} grep -H -n "System.out.print" {} | cut -f-2 -d: | sed "s/\(.*\):\(.*\)/filename is \1 and line number is \2/ What I'm trying to do here is,I'm trying to iterate through sub folders and check what files contains "System.out.print" (using grep) using 2nd grep trying to get file names and line numbers using sed command I display those to console. from here I want to remove "System.out.print" with "XXXXX" how I can pipe sed command to this? pls help me thanxx

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• How can I associate .sh files with Cygwin?

  - by Jerph

  I'd like to run a long rsync command in Cygwin by double clicking on a .sh file in Windows. It must start in the file's containing directory (e.g. /cygdrive/c/scripts/) so that relative paths work. Anyone gotten this to work? Note: I've just found chere, a Cygwin package that manages Windows context menus (Bash Prompt Here). It might have some clues.

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• Setting PATH in Makefile run by eclipse

  - by Chris Jefferson

  I have a Makefile which runs fine from a bash shell, but fails to run from Eclipse. This is because the path I am setting in my .bash_profile is not getting used. What is the best way of making this happen? Is there somewhere else I could put the path, to make sure it is invoked in non-interactive shells (which is I assume how eclipse is running make)?

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• " mv * dir " doesn't work in a script?

  - by Anxo

  I want to move all the files to a new dir. From the command line I can do "mv . newdir" but if I try with this script: #!/bin/bash -f # mkdir newdir mv *.* newdir I get the following message: "mv: rename . to newdir/.: No such file or directory"

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• How to apply shell command to each line of a command output?

  - by Alex

  Suppose I have some output from a command (such as ls -1): a b c d e ... I want to apply a command (say echo) to each one, in turn. E.g. echo a echo b echo c echo d echo e ... What's the easiest way to do that in bash?

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• How to search for multiple strings in a file

  - by topwoman

  I want to search for the occurrence of string1 OR string2 OR string3, etc. in a file, and print only those lines (to stdout or a file, either one). How can I easily do this in bash?

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• Pie chart of *nix shell use [closed]

  - by hayk.mart

  I've encountered a situation where it would be very helpful to know the breakdown of shell use by percentage. For example, I'm looking for something like bash: X%, sh: Y%, csh, tcsh, zsh, ksh, dash, etc.. Obviously, I know there are several complications - multiple shells, the definition of "use", uncertainty and so forth, but I would like to see an informed answer derived from actual data and based on some stated metric, even if the result could be horribly wrong. Bonus if there is historical data demonstrating a shift in preferences.

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• Fork two processes and kill the second when the first is done

  - by User1

  The title says it all. I want to create a bash script that will launch two processes and kill the second process when the first is done. Here's an example: #fork first process producer& #fork second process consumer& #wait for producer to finish ... #kill the consumer ... I have a feeling this can get ugly but has a very simple solution. Please help me fill in the blanks.

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• Using AWK find a smallest number in a second column bigger than x

  - by Andrei

  I have a file with two columns, sdfsd 1.3 sdfds 3 sdfsdf 2.1 dsfsdf -1 if x is 2 I want to print sdfsdf 2.1 How to express it in awk (bash or sed is fine too)

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• How do I play with test command properly?

  - by httpinterpret

  [root@jiaoyou ~]# test 1 = 1 -a 0 = 1 [root@jiaoyou ~]# if [1 = 1 -a 0 = 1]then echo 1;else echo 2;fi -bash: syntax error near unexpected token `else' Why test doesn't give any output and the if statement fails? Can someone point out what's wrong here?

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• Modify an exact line number of a text file and add certain string after the end of the line

  - by Werner

  Hi, given a plain text file, how can I do, using bash, awk, sed, etc, to, at the line number NLINE, add the string STR, just n spaces after the end of the line? So, for instance, if this is the line NLINE: date march 13th for 5 spaces, we get date march 13th STR and one gets the modification in a new file. Thanks

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