linux - How can I print a particular list of text using gawk/grep ? for example I would like to print the names of all the colors present in txt file -

just started learning linux. getting hands dirty grep , gawk.

suppose want print available names in .txt file or example have text file goes;

"blah blah blah blah blah  blah bhah blah blah blah  joe  allen  david  john  blah blah blah blah blah "  

now print names found in text file only. how go doing it? syntax be?

having file "names" names you're looking for, 1 per line:

 allen  david  joe  ... 

then search of of lines:

grep -f names thefiles 

you might need add option -f (the lines in file "names" strings, , not regex-en) or option -w (the match must word, not part of word) well, or option -o (print match, instead of line).