You can use xdotool for automation. Install on Ubuntu with sudo aptitude install xdotool Then you can search for windows and send keys or mouse events, see man xdotool for the full documentation. I use following script on Ubuntu 16.04 LTS during development: WID=`xdotool search –name “Mozilla Firefox” | head -1` xdotool windowactivate $WID xdotool … Read more
declare inside a function doesn’t work as expected. I needed read-only global variables declared in a function. I tried this inside a function but it didn’t work: declare -r MY_VAR=1 But this didn’t work. Using the readonly command did: func() { readonly MY_VAR=1 } func echo $MY_VAR MY_VAR=2 This will print 1 and give the … Read more
This happens because grep interprets — as an option instead of a text to look for. Instead, use –: grep — “—” your_file This way, you tell grep that the rest is not a command line option. Other options: use grep -e (see Kent’s solution, as I added it when he had already posted it … Read more
EDIT: As mentioned by Marie and James if you only want to run the command if it exists, npm has an option for that: npm run test –if-present This way you can have a generic script that work with multiple projects (that may or may not have an specific task) without having the risk of … Read more
find . -name “.*” -print I don’t know the MAC OS, but that is how you find them all in most *nix environments. find . -name “.*” -exec rm -rf {} \; to get rid of them… do the first find and make sure that list is what you want before you delete them all. … Read more
source your script, don’t execute it like ./foo.sh or sh foo.sh If you execute your script like that, it is running in sub-shell, not your current. source foo.sh would work for you.
This question has been asked in another thread, and this is the best answer IMO: export LOG_FILE_PATH=/expanded/path/of/the/log/file/../logfile.log cat Text_File.msh | envsubst > Text_File_expanded.msh if on Mac, install gettext first: brew install gettext see: Forcing bash to expand variables in a string loaded from a file
If the lines are all unique you could grep the lines you want to remove into a file, and then use that file to remove the lines from the original, e.g. grep -C 2 “line I don’t want” < A.txt > B.txt grep -f B.txt A.txt
‘Hysterical Raisins’, aka Historical Reasons. The explanation from JesperE (or the Bash man page on shell parameter expansion) is accurate for what it does: If $1 exists and is not an empty string, then substitute the quoted list of arguments. Once upon 20 or so years ago, some broken minor variants of the Bourne Shell … Read more
$- prints The current set of options in your current shell. himBH means following options are enabled: H – histexpand: when history expansion is enabled m – monitor: when job control is enabled h – hashall: Locate and remember (hash) commands as they are looked up for execution B – braceexpand: when brace expansion is … Read more