Concatenate and print files (POSIX)
cat [-c] [-n|-r] [-u] [file...]
QNX Neutrino, Linux, Microsoft Windows
The cat utility reads files in the order you specify and writes their contents to standard output.
Write the contents of myfile to standard output:
cat myfile
Concatenate doc1 and doc2 and write the result to doc.all:
cat doc1 doc2 > doc.all
Because of the shell language mechanism used to perform output redirection, a command such as:
cat doc doc.end > doc
causes the original data in doc to be lost. The file doc is opened for write by the shell, and therefore truncated to zero length, before cat is executed.