Follow this: start Automator.app select Application click Show library in the toolbar (if hidden) add Run shell script (from the Actions/Utilities) copy & paste your script into the window test it save somewhere (for example you can make an Applications folder in your HOME, you will get an your_name.app) go to System Preferences -> Accounts … Read more
Try to use a loop, let, and printf for the padding: a=1 for i in *.jpg; do new=$(printf “%04d.jpg” “$a”) #04 pad to length of 4 mv -i — “$i” “$new” let a=a+1 done using the -i flag prevents automatically overwriting existing files, and using — prevents mv from interpreting filenames with dashes as options.
In the example PWD= /bin/pwd, the variable PWD is set to the empty string before executing the command /bin/pwd. The change only takes effect for that line. This can be useful to make a temporary change to a variable for the purposes of running a command, without affecting the original value. Another example of this … Read more
The reason the code with local returns 0 is because $? “Expands to the exit status of the most recently executed foreground pipeline.” Thus $? is returning the success of local You can fix this behavior by separating the declaration of x from the initialization of x like so: $ fun() { local x; x=$(false); … Read more
Ok, it got a bit ugly, but here is a solution: unset t_std t_err eval “$( (echo std; echo err >&2) \ 2> >(readarray -t t_err; typeset -p t_err) \ > >(readarray -t t_std; typeset -p t_std) )” where (echo std; echo err >&2) needs to be replaced by the actual command. Output of stdout … Read more
In answer to your first question, there’s no parameter substitution because you’ve put the delimiter in quotes – the bash manual says: The format of here-documents is: <<[-]word here-document delimiter No parameter expansion, command substitution, arithmetic expansion, or pathname expansion is performed on word. If any characters in word are quoted, the delimiter is the … Read more
To check if a directory exists in a shell script, you can use the following: if [ -d “$DIRECTORY” ]; then # Control will enter here if $DIRECTORY exists. fi Or to check if a directory doesn’t exist: if [ ! -d “$DIRECTORY” ]; then # Control will enter here if $DIRECTORY doesn’t exist. fi … Read more
You can use “${user_defined_directory/#~/$HOME}” to replace a “~” at the beginning of the string with the current user’s home directory. Note that this won’t handle the ~username/subdir format, only a plain ~. If you need to handle the more complex versions, you’ll need to write a much more complex converter.
To save both stdout and stderr to a variable: MYVARIABLE=”$(path/myExcecutable-bin 2>&1)” Note that this interleaves stdout and stderr into the same variable. To save just stderr to a variable: MYVARIABLE=”$(path/myExcecutable-bin 2>&1 > /dev/null)”
If you have GNU Parallel http://www.gnu.org/software/parallel/ installed you can do this: parallel gzip ::: *.log which will run one gzip per CPU core until all logfiles are gzipped. If it is part of a larger loop you can use sem instead: for i in *.log ; do echo $i Do more stuff here sem -j+0 … Read more