Alternative ways to write these options. You can write mysql -u “$MYSQL_ROOT” -p”$MYSQL_PASS” -e “SHOW DATABASES” If [password is] given, there must be no space between –password= or -p and the password following it. If no password option is specified, the default is to send no password. to pass empty strings as separate arguments. Your … Read more
[ … ] doesn’t do pattern matching. /* is being expanded to the contents of /, so effectively you have if [ “$DIR” = /bin /boot /dev /etc /home /lib /media … /usr /var ] or something similar. Use [[ … ]] instead. if [[ “$DIR” = /* ]]; then For POSIX compliance, or if … Read more
For what it’s worth, a cut-based solution: NEW_LINE=”`echo “$LINE” | rev | cut -d/ -f2- | rev`/”
It surprises me that nobody has the correct answer to this. Today i faced exactly the same problem and google didn’t help. After 2 hours i found that when placing a file in /etc/cron.d the schedule line has to contain an extra option….. I allways use this for my crontab -e # Minute Hour Day … Read more
Environment Variables If you want to set a number of environment variables into your docker image (to be used within the containers) you can simply use env_file configuration option in your docker-compose.yml file. With that option, all the entries in the .env file will be set as the environment variables in image and hence into … Read more
I do understand I’m adding an answer to an old question, but I feel the tooling has improved lately and would like to give additional suggestions in order to help out others who are viewing this question. I have recently found TomDoc.sh, which uses TomDoc style comments in shell scripts. The tool provided can then … Read more
In Arch, /bin/sh is a symlink to /bin/bash, which has quite a few rules about startup scripts, with special cases when called sh : If bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, … If you start it from the … Read more
The -e causes the command to stop on any errors. A more typical syntax is to separate commands with && to stop on any error. The -x causes the shell to output each command being run. This is useful for debugging scripts. From the bash man page under set: -e Exit immediately if a pipeline … Read more
Bash does not support local functions, but depending on your specific script and architecture you can control the scope of your function name through subshells. By replacing the {..} with (..) in your definition, you’ll get the output you want. The new definition of usage will be limited to the function, but so will e.g. … Read more
The user’s chosen editor should be in $EDITOR, but you must still choose a sane default. “${EDITOR:-vi}” file.txt