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Extract part of string in Bash

When I import my GPG keys, I get a response back: I would very much like to extract the key’s ID LOL12345. The command I run that returns the output is as follows: Answer Try to use grep: -P use perl regex style. -o print only the matched part. -m 1 exit after the first match. This will ensure, that

qmake match linux and mac separatly

I’m creating a .pro file for both Mac and Linux platform. I will link the qca framework on Mac, and libqca on Linux However, the unix part matches both mac and linux, any ideas? Answer You can use the colon : to take a product (logical-and) of multiple conditions, some of which may be negated:

grep with star symbol

What is the difference between grep commands: and what is different if I search text as “text”. Answer grep requires (at least) two arguments — what you are searching for, and where you are searching for it. If the second argument is not provided, then it will use stdin instead. grep text* i…

Memory used by compiling a code

I use time command to measure the time used to execute a file as: My question: are there any command like time can give the memory used by executing an executable file in linux? Answer You can use /usr/bin/time -v ./filename. It will print a lot of information including memory use. Note: Will use the shell bu…

cURL empty request data if https connection

I try to send the file via POST. Before that i used http connection and everything worked. But now var_dump($_REQUEST); in my php-file returns an empty array. This my curl log: $ curl -X POST -F “id=1” -F “file=@/tmp/file.txt” https://MY_DOMAIN/save_file.php -v Hostname was NOT found i…