Temporarily change time
I need to test aspects of my software that only happen at certain times of the day. Rather than waiting whole days (and getting here at 2:00 AM), I’d like to change the time.
Unix & Linux
Difference between mail and mailx?
Whats the difference between mail and mailx? I’m trying to troubleshoot a problem where I can send mail from server A with this echo $MESSAGE | mail -s “$SUBJECT” -r $FROM $RECIPIENTS command but executing the same command from server B throws me this error (Both servers are RHEL) mail: invalid option — r Usage: … Read more
Is there a faster way to remove a line (given a line number) from a file?
A related question is here.
What can I do if bash stops echoing?
One of the applications I use at work sometimes screws with my bash and so I don’t see my own input anymore. I.e.
how to understand the output of “echo $-“?
How to understand the output of echo $-? It looks like some kind of flag characters. I can’t get a clue by googling.
Batch renaming files with pattern
I have some files named like these:
Install VM from command line with virt-install
Disclaimer :
Find X.org pointer grab owner
I have an application that seems to have grabbed the mouse (I can move it but can’t click anywhere), is there a way to find which app owns the X.org mouse grab?
What’s the progress regarding improving system performance/responsiveness during high disk I/O?
Whenever there is high disk I/O, the system tends to be much slower and less responsive than usual. What’s the progress on Linux kernel regarding this? Is this problem actively being worked on?
How to use grep/ack with files in arbitrary encoding?
On my Linux desktop I have a UTF-8 locale. When I try to search some KOI8-R encoded files with grep (ack), it fails. If I manually encode the pattern into KOI8-R and pass that as an argument, it works.