Concatenate and print (display) the content of files.
The cat command can be piped into grep to find specific words in the file:
cat file.txt | grep keyword output.txt
cat file.txt | grep keyword output.txt
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Red stare mac os. 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
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
When grep is used to display multiple files, it will prepend each line of output with the filename:
$ grep . *.txt
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Display all .txt files:
$ cat *.txt
$ cat *.txt
Concatenate two files:
$ cat File1.txt File2.txt > union.txt
$ cat File1.txt File2.txt > union.txt
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
$ sort -u File1.txt File2.txt > unique_union.txt
Put the contents of a file into a variable
$ my_variable=`cat File3.txt`
$ my_variable=`cat File3.txt`
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Related macOS commands:
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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.
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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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