Suppose I have variable "x" in bash. How can I test if it's some number? I tried if x=5; then echo "it is 5"; fi but that doesn't work, then I tried if x==5; then echo "it is 5"; fi but that also doesn't work, then I tried if [x==5]; then echo "it is 5"; fi but that also doesn't work, then I tried if [[x==5]]; then echo "it is 5"; fi...
I'd like to distribute a set of build variables (which someone should append to their LDFLAGS), in a form that can both be included in a Makefile and in a shell script. What I have now is a file buildflags.conf: LDFLAGS_EXTRA="-static -foo -bar" I want my users to be able to, when they're using makefiles: include buildflags.conf LDF...
I've never done shell script before and now I'm running into a simple problem... I have a for loop which executes every time the run.sh script. To see how far the script has already run I want to print e.g. every 5000 the actual index. $counter = 0 for (( i = 0 ; i <= 5000; i++ ))do if ($i = $counter); then echo "$c...
Git has the very handy archive command which allows me to make a copy of a particular commit in a .zip archive like so: git archive -o ../latest.zip some-commit This will contain the entire working tree for that commit. Usually I just need the changed files since a previous release. Currently I use this to get those files into a zip: ...
In a bash script, I have to include the same file several times in a row as an argument. Like this: convert image.png image.png image.png [...] many_images.png where image.png should be repeated a few times. Is there a bash shorthand for repeating a pattern? ...
For Ex : echo "adsa " >> a.txt echo "asdad " >> a.txt in my file adsa asdad But i am looking for adsa asdad ...
In linux, if I put a command in a script that contains an alias, I see that it doesn't get expanded. How can I fix that? I am using bash. ...
My understanding was that one could not control the file descriptor (integer) assigned by the OS when opening a new file using open(). How then is it possible in a bash shell to assign a specific file descriptor using a command like exec 5>&1 (I suppose I could find out by reading the bash sources...) ...
I have a java program that I am trying to generate 3 outputs for, and then rename them depending on what the input file was originally called. The problem is that only the input file is being moved. I think this might be an issue regarding relative file commands. Here is my script. (Also, I'm open to suggestions on making this script b...
I looked at bash man page and the [[ says it uses Conditional Expressions. Then I looked at Conditional Expressions section and it lists the same operators as test (and [). So I wonder, what is the difference between [ and [[ in bash? Thanks, Boda Cydo. ...
When I echo $PATH on my command line, it returns /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Applications/MAMP/Library/bin:/usr/local/git/bin:/usr/X11/bin When I execute this php code exec('echo $PATH; whoami; less /etc/paths; 2>&1') I get string 'echo $PATH; whoami; less /etc/paths; 2>&1' (length=56) array 0 =>...
I'm wondering if there is a better way to make a daemon that waits for something using only sh than: #! /bin/sh trap processUserSig SIGUSR1 processUserSig() { echo "doing stuff" } while true; do sleep 1000 done In particular, I'm wondering if there's any way to get rid of the loop and still have the thing listen for the signals. ...
In various guides and scripts I come across people tend to use different syntax of if statements. What's the difference and what are best practices? I believe all the following statements, and many more variants, will return true: bar="foo" if [ "foo" = "foo" ] if [[ "foo" == $bar ]] if [ "foo" = "$bar" ] if [[ "foo" = "$bar" ]] if [[ "...
How can I convert a string containing glob characters such as /var/lib/gems/*/bin into a colon-separated string of filenames (i.e. PATH compatible) matching the pattern? i.e. echo /var/lib/gems/*/bin will return /var/lib/gems/1.8/bin /var/lib/gems/1.9.1/bin I want /var/lib/gems/1.8/bin:/var/lib/gems/1.9.1/bin instead. The obv...
I have a file called inp.txt which lists 3 directory names #!/bin/sh while read dirname do echo $dirname "ls -l" $dirname done < inp.txt When I run the above, I get this error: line 5: ls -l: command not found If I do just "ls" instead of "ls -l", it works fine. What am I missing here? ...
how do i print using echo in bash so the row wont "jump" abit to the right cause of the length of the Variable can u please help me with a command that do so ...
I'm trying to store all my profile configuration files (~/.xxx) in git. I'm pretty horrible at bash scripting but I imagine this will be pretty straight forward for you scripting gurus. Basically, I'd like a script that will create symbolic links in my home directory to files in my repo. Twist is, I'd like it warn and prompt for overwri...
Hello -- I'm writing a bash script that needs to sudo multiple commands. I can do this: ( whoami ; whoami ) but I can't do this: sudo ( whoami ; whoami ) How do I solve this? ...
I would like to call the Java class file from compiling the following code: import java.io.*; public class hex_to_dec { private BufferedReader bufferedReader; private BufferedWriter bufferedWriter; public hex_to_dec (String stringPath, String stringPath_dec) { try { bufferedReader = new Buf...
Hi all: I know this must be a stupid question, but how could I pipe the result from a which command to cd? This is what I am trying to do: which oracle | cd cd < which oracle But none of them works :( Is there a way to achieve this (rather than copy/paste of course)? Thanks a lot in advance! Edit : on second thought, this command...