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
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:
In bash: The ‘ and ‘ around the END delimiter are important, otherwise things inside the block like for example $(command) will be parsed and executed. For an explanation, see this and this question.
Have a look at timeit, the python profiler and pycallgraph. Also make sure to have a look at the comment below by nikicc mentioning “SnakeViz“. It gives you yet another visualisation of profiling data which can be helpful. timeit Essentially, you can pass it python code as a string parameter, and it will run in … Read more
Something like this should work (suggested by orip): if you prefer subshells, you could try the following (though it is more fragile): Git will invoke SSH which will find its agent by environment variable; this will, in turn, have the key loaded. Alternatively, setting HOME may also do the trick, provided you are willing to … Read more
Ibrahim’s comment on the other answer is the correct way to alter an existing user’s home directory. Change the user’s home directory: usermod is the command to edit an existing user.-d (abbreviation for –home) will change the user’s home directory. Change the user’s home directory + Move the contents of the user’s current directory: -m (abbreviation for –move-home) will move … Read more
It is a small error. arr= (one two three) should’ve been arr=(one two three) Also you can’t use \n in echo. Use printf if you want to use \n. And fixing the rest of the errors, the code looks like this.
Problem is in your if [[…]] expression where you are using 2 grep commands without using command substitution i.e. $(grep ‘pattern’ file). However instead of: You can use grep -q: As per man grep:
Well, if your phone is rooted you can run commands with the su -c command. Here is an example of a cat command on the build.prop file to get a phone’s product information. This invokes root permission and runs the command inside the ‘ ‘. Notice the 5 end quotes, that is required that you close ALL your end quotes or you … Read more