Linux and Unix cat command
Allows you to look, modify or combine a file.
cat filename [-n] [-b] [-u] [-s] [-v]
|filename||The name of the file or files that you wish to look at or perform tasks on.|
|-n||Precede each line output with its line number.|
|-b||Number the lines, as -n, but omit the line numbers from blank lines.|
|-u||The output is not buffered. (The default is buffered output.)|
|-s||cat is silent about non-existent files.|
|-v||Non-printing characters (with the exception of tabs, new-lines and form-feeds) are printed visibly. ASCII control characters (octal 000 - 037) are printed as ^n, where n is the corresponding ASCII character in the range octal 100 - 137 (@, A, B, C, . . ., X, Y, Z, [, \, ], ^, and _); the DEL character (octal 0177) is printed ^?. Other non-printable characters are printed as M-x, where x is the ASCII character specified by the low order seven bits.|
|-e||A $ character will be printed at the end of each line (prior to the new-line).|
|-t||Tabs will be printed as ^I's and formfeeds to be printed as ^L's.|
*If the -v is used -e and -t will be ignored.
cat file1.txt file2.txt > file3.txt
Reads file1.txt and file2.txt and combines those files to make file3.txt.