Jul 3, 2023 · 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 …

Aug 7, 2011 · 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 …

I have problem sending AT commands to my USB modem. At first I tried php-serial class, but when I was reading data, I got endless loop with strange data. Then I tried to debug problem and opened pu...

Mar 1, 2018 · I would like to use cat /dev/ttyUSB0 or something similar to monitor serial communication happening through my USB-serial adapter. I am successfully able to send serial commands from …

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 …

Jun 24, 2018 · Stop endless loop .sh script Ask Question Asked 7 years, 5 months ago Modified 7 years, 5 months ago

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...

Jan 31, 2013 · 64 /dev/zero is a special file (in this case, a pseudo-device) that provides an endless stream of null characters (so hex 0x00)? That's why your cat is not outputting anything (but try …

Mar 6, 2022 · What's replenishing my entropy so well, and how can I find the specific source of randomness? As of kernel 5.6, /dev/random obtains randomness from the kernel's CRNG, which is …