cat—concatenates and displays files
cat [ –bnsuvet ] filename...
cat reads each filename in sequence and writes it on the standard output. If no input file is given, or if the argument – is encountered, cat reads from the standard input file.
Example A.9.
1 cat /etc/passwd
2 cat -n file1 file2 >> file3
EXPLANATION
Displays the contents of the /etc/passwd file. Concatenates file1 and file2 and appends output to file3. The –n switch causes each line to be numbered.
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