commandexists () { # Check if a command exists command -v $1 &> /dev/null if [[ $? -eq 0 ]]; then return 0 else return 1 fi } pkg-install () { pkg="${1:?"Error: pkg parameter unset."}" step "${msg_install}: ${pkg}" substep "Installing ${pkg} from the Arch Linux...
If you add set-o errexitto your script, from that point forward it will abort the execution if any command exists with a code!= 0. Buterrexitisn't used when executing functions inside anifcondition, so instead of remembering that exception, I rather do explicit error handling. Take a look...
我可以理解,开发人员不想使用苹果使用的旧bash v3。但从用户的帖子来看,安装一个较新的bash并不那么好 所以我看了wireguard的wg-quick。需要支持的唯一变化,两个bash版本都是为了摆脱关联数组SERVICE_DNS,并处理v3的BASHPID。 解决方案 那么就有了一下的操作 ...
However, the Linux time command has several versions. What are Bash time command versions? The two most commonly used shells in Linux are Bash and Zsh. These shells have built-in time command versions. To detect if “time” is a binary or inbuilt keyword in a Linux shell, you can use ...
dir_mode=0777 //192.168.x.x /mnt/win# maybe need run the following command before mountapt install cifs-utils# if no cifs filesystem supporting lib in system (by checking if /sbin/mount.cifs exists)# mount an iso image filemount -o loop /path/to/image.iso /path/to/mount/point# ...
tar: Detect GNU/other from --version only once per session (88c671a) test suite: Fix tar failure caused by previous tar change (198ab64) test suite: Tolerate "See 'man feh'" feh --help output (b4b8916) test suite: Don't insist on property completions if synclient -l fails (9716a...
is_screensaver_running.scpt - detect if the screensaver is running to stop sending keystrokes or mouse clicks screensaver_activate.scpt - activate screensaver See also Mac page in HariSekhon/Knowledge-Base. Monitoring monitoring/ directory: dump_stats.sh - dumps common command outputs to text files...
While a tool for this exists in Windows as the pause batch command, Linux has no direct equivalent. In this tutorial, we discuss what options Linux users have to emulate or simulate the batch pause command with Bash. First, we check how Bash scripts run and what control we have over ...
We detect nested sort commands, and remove redundant ones. We run sort -u on the final output to make all results unique. We estimate the number of concurrently running sort commands, and assign each of them an equal amount of memory, if the buffer size parameter is available. Finally, ...
You might also want to put “set -eu” or at least “set -u” at the beginning of your scripts, along with setting IFS. This does nothing for pathnames, but thesecanhelp detect other script errors. By the way, the need for proper quoting is not limited to Bourne shells. TheWindows...