I have a program which produces useful information on stdout but also reads from stdin. I want to redirect its standard output to a file without providing anything on standard input. So far, so goo...
I am doing a unix script using until loop.The idea of my script is it need to continuously verify the url status whether is up or down.When its up, it will exit the loop. In my script, I will use c...
To kill the outer loop I usually add a sleep command and press CTRL-C some more times: while :; do LONGTIME_COMMAND; sleep 1; done. Please notice: the colon behind while is interpreded as TRUE, so this is an endless loop.
I encountered the following in /var/log/syslog on Ubuntu 14.04. Mar 24 09:41:19 ripple pulseaudio[4838]: [autospawn] core-util.c: Failed to create secure directory (/run/user/112/pulse): No such file or directory Mar 24 09:41:19 ripple pulseaudio[4838]: [autospawn] lock-autospawn.c: Cannot access autospawn lock. Mar 24 09:41:19 ripple pulseaudio[4838]: [pulseaudio] main.c: Failed to acquire ...
After a recent update, kate seems to fork a copy of itself, presumably with some parameter which prevents an endless recursion, and then exits. Presumably this was intended to help users who run kate
6 Your loop is starting an endless number of shells, but one after the other, not in parallel. The first time the loop runs, it runs bash, which starts a new shell and displays the prompt.
Is there any elegant method/technology-to-use/hack in linux, to achieve such file continuously written is at maximum N bytes long and always contains only last written data (sequentially)? This means no large moves (file to file, memory to file) just little tweaking with the last/first data blocks.
Also, in while [ true ], the test checks if true is a non-empty string. It obviously is, so this does work in giving an endless loop. But [ false ] would also be always true, so a test like that is perhaps a bit misleading. Could use while true; do instead.
How would you compare these editors? What are the pros and cons of each? [note] This is not meant to be answered by those who "hate one and love another" or those who haven't used both.
