Why does the less-than sign not work as a replacement for cat in bash?
I heard about “useless use of cat” and found some suggestions, but the following outputs nothing in my bash shell.
shell
Remove ^C when CTRL+C
Is there any way to remove ^C when you hit CTRL+C in the shell include with Red Hat Enterprise Linux 6 (“Santiago”)? I have permission to edit my own .bash_profile.
How do I test to see if an application exists in $PATH?
I’m trying to write all of my sh startup/env scripts to work with as much DRY and as much: “works on every *nix I clone it to”, as possible. This means making sure that if I try to run code that’s not there, that the code fails gracefully. To that end I need to be able to test if programs exist. I know how to test if a file exists, but I’m not sure how to test to see if an application is executable within the path. I’d rather use the $PATH, as some of these need to work on arch, ubuntu, and centos. Some might be installed in my homedir, on systems where I don’t have root, others might not be installed, and others yet my be installed in system paths.
What is DISPLAY=:0?
What is DISPLAY=:0 and what does it mean? It isn’t a command, is it? (gnome-panel is a command.) DISPLAY=:0 gnome-panel Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post … Read more
sed with multiple expression for in-place argument
I am trying to replace multiple words in a file by using
stdin, stderr, redirection and logs
Is there a difference between those two lines ?
Finding out the default shell of a user within a shell script
I was wondering if there’s a way to find out the default shell of the current user within a shell script?
How to trigger error using Trap command
I am using Ubuntu 12.04.2. I am trying to use “trap” command to capture abnormal or error in my shell script but I am also trying to manually trigger “Error” exit.
Get environment variable of other user
Is there a way I can see the environment variable of an other user? I want to do that as root, so permissions won’t be a problem I guess. For the user himself, I use echo $PATH or set | grep PATH (or set when I don’t remember the variable name). What would be a … Read more
Is there a POSIX (or at least a popular) utility to set the current working directory when invoking a program?
We have env(1) to modify the environment of the command we want to run (for example env MANPAGER=more man dtrace). Is there something similar but for modifying the directory that the command is going to be started in?