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In bourne shell I have the following: VALUES=`some command that returns multiple line values` echo $VALUES Looks like: "ONE" "TWO" "THREE" "FOUR" I would like it to look like: "ONE" "TWO" "THREE" "FOUR" Can anyone help? echo $VALUES | tr '\n' ' ' Another method, if you want to not just print out your code but assign it to a variable, and not have a spurious space at the end: $ var=$(tail -1 /etc/passwd; tail -1 /etc/passwd) $ echo "$var" apache:x:48:48:Apache:/var/www:/sbin/nologin apache:x:48:48:Apache:/var/www:/sbin/nologin $ var=$(echo $var) $ echo "$var" apache:x:48:48:Apache:/var/www:

I want to write multiple lines over and over to the terminal. Something like echo "One Line" echo "Two Lines" echo "\r\b\rThree Lines" echo "Four Lines" Ideally this would first output: One Line Two Lines And this output would then be replaced with Three Lines Four Lines Trouble is, while the carriage return will let you overwrite one line of output, you can't get past the \n with a \b. How do I then overwrite multiple lines? I found a solution for this one that took a little digging and I'm still not entirely sure on how this one works. However, it seems the program tput will allow you to get

How do I write a script to determine if a file is older than 30 minutes in /bin/sh? Unfortunately does not the stat command exist in the system. It is an old Unix system, http://en.wikipedia.org/wiki/Interactive_Unix Perl is unfortunately not installed on the system and the customer does not want to install it, and nothing else either. Schwern Here's one way using find . if test "`find file -mmin +30`" The find command must be quoted in case the file in question contains spaces or special characters. The following gives you the file age in seconds: echo $(( `date +%s` - `stat -L --format %Y

I'm trying to run this shell script in order to install RVM in an Ubuntu box #!/bin/bash RVMHTTP="https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer" CURLARGS="-f -s -S -k" bash < <(curl $CURLARGS $RVMHTTP) but I get the following error Syntax error: Redirection unexpected Also tested not using the variables, but same result, could you tell what I'm missing? Tilo #!/bin/bash CURL='/usr/bin/curl' RVMHTTP="https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer" CURLARGS="-f -s -S -k" # you can store the result in a variable raw="$($CURL $CURLARGS $RVMHTTP)"

I have bash script and it requires bash. Another person try to run it with sh script_name.sh And it fails because sh is symbolic link to dash in his distribution. $ ls -la /bin/sh lrwxrwxrwx 1 root root 4 Aug 25 16:06 /bin/sh -> dash I have an idea to use wrapper script: #!/bin/sh bash script_name.sh The goal is to run .sh script by sh with bash in system having symbolic link to dash. Well, usually you use the shebang to tell the shell to use the correct interpreter: #!/bin/bash # your script here You have to set the script to be executable: chmod +x my_script.sh And let the user start it with

I see a lot of shell scripts that do: trap cmd 0 1 2 3 13 15 # EXIT HUP INT QUIT PIPE TERM In every shell I have access to at the moment, all the traps other than 0 are redundant, and cmd will be executed upon receipt of a signal if the trap is simply specified: trap cmd 0 Is the latter specification sufficient, or do some shells require the other signals to be specified? Brandon Horsley I think trap 0 is executed just prior to script termination in all cases, so is useful for cleanup functionality (like removing temporary files, etc). The other signals can have specialized error handling but