cat






cat, read, nobs − catenate files

cat [ file...  ]
read [ ‐m ] [ ‐n nline ] [ file...  ]
nobs [ file...  ]

Cat reads each file in sequence and writes it on the
standard output.  Thus

     cat file

prints a file and

     cat file1 file2 >file3

concatenates the first two files and places the result on
the third.

     If no file is given, cat reads from the standard input.
Output is buffered in blocks matching the input.

     Read copies to standard output exactly one line from
the named default standard input.  It is useful in
interactive scripts.

     The ‐m flag causes it to continue reading and writing
multiple lines until end of file; ‐n causes it to read no
more than nline lines.

     Read always executes a single write for each line of
input, which can be helpful when preparing input to programs
that expect line‐at‐a‐time data.  It never reads any more
data from the input than it prints to the output.

     Nobs copies the named files to standard output except
that it removes all backspace characters and the characters
that precede them.  It is useful to use as $PAGER with the
Unix version of when run inside a win (see window.

/src/cmd/cat.c
/src/cmd/read.c
/bin/nobs



Read exits with status eof on end of file or, in the ‐n
case, if it doesn’t read nlines lines.

Beware of and which destroy input files before reading them.