Concatenate and print (display) the content of files.
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The cat command can be piped into grep to find specific words in the file:
cat file.txt grep keyword output.txt
Patch, the 'Killer Cat', passed away today. He was 15 years old, born in 2005.Patch was a strong part of my childhood, on my father's side of the family. SZA) - Doja Cat: Best Friend (feat. Doja Cat) - Saweetie: Levitating (feat. DaBaby) - Dua Lipa: Up - Cardi B: We're Good - Dua Lipa: Lyrics; Search; Request.
However all modern versions of grep have this built-in. Running a single command/process is more efficient, and so with large files will be noticably faster:
grepkeyword file.txt output.txt
grep can also display an entire file, (like cat), by using the grep keyword '.' which will match lines with at least 1 character. Alternatively the grep keyword '^' will match the beginning of every line including blank lines.
When grep is used to display multiple files, it will prepend each line of output with the filename:
$ grep . *.txt
Examples:
Display a file:
$ cat myfile.txt
Display all .txt files:
$ cat *.txt
Concatenate two files:
$ cat File1.txt File2.txt > union.txt
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If you need to combine two files but also eliminate duplicates, this can be done with sort unique:
$ sort -u File1.txt File2.txt > unique_union.txt
Put the contents of a file into a variable
$ my_variable=`cat File3.txt`
“To be nobody but yourself - in a world which is doing its best, night and day, to make you like everybody else - means to fight the hardest battle which any human being can fight, and never stop fighting” ~ E. E. Cummings
Related macOS commands:
cp - Copy one or more files to another location.
mv - Move or rename files or directories.
hexdump - View binary file.
tail - Output the last part of files.
textutil - Manipulate text files in various formats.
vis - Display non-printable characters in a visual format.
Stupid Cat tricks - by Mike Chirico.
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