Bash does not support multidimensional arrays, nor hashes, and it seems that you want a hash that values are arrays. This solution is not very beautiful, a solution with an xml file should be better : EDIT: this answer is quite old, since since bash 4 supports hash tables, see also this answer for a solution without … Read more
If you use the -i option you need to provide an extension for your backups. If you have: The command (note the lack of space between -i and ” and the -e to make it work on new versions of Mac and on GNU): Create 2 backup files like: There is no portable way to avoid making backup files because it is impossible … Read more
Updated answer (Jan 2020) xargs is now the recommended tool to achieve parallel execution. It’s pre-installed almost everywhere. For running multiple rsync tasks the command would be: This will list all folders in /srv/mail, pipe them to xargs, which will read them one-by-one and and run 4 rsync processes at a time. The % char replaces the input argument for each command call. Original … Read more
The invalid option is because fgets() keeps the ‘\n’ when you press enter, try this when you are trying to call ls -l you are passing “-l\n” as the option, hence the message. You will have to change to
Multiprocessing
You can use the key option of the sort command, which takes a “field number”, so if you wanted the second column: -n, –numeric-sort compare according to string numerical value For example:
Here’s how to do it with the # and % operators in Bash. ${x%.bar} could also be ${x%.*} to remove everything after a dot or ${x%%.*} to remove everything after the first dot. Example: Documentation can be found in the Bash manual. Look for ${parameter%word} and ${parameter%%word} trailing portion matching section.
You have got the PATH slightly wrong. You need the PATH to “the containing directory”, not the actual executable itself. Your PATH should be set like this: without the extra sql part in it. Also, you must remove the spaces around the equals sign. Keywords: Postgresql, PATH, macOS, OSX, psql
Solution 1: For some reason, virtualenvwrapper.sh installed in /usr/bin/virtualenvwrapper.sh, instead of under /usr/local/bin. The following in my .bash_profile works… My install seems to work fine without sourcing virtualenvwrapper_bashrc Solution 2: Alternatively as mentioned below, you could leverage the chance that virtualenvwrapper.sh is already in your shell’s PATH and just issue a source `which virtualenvwrapper.sh`
When using nohup and you put the task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via kill PID or kill -9 PID (if you need to force kill). … Read more