Redirecting command output to a file
Commands entered at the command line typically use the three standard files described previously, but you can redirect the output for a command to a file you name. If you redirect output to a file that does not already exist, the system creates the file automatically.
Most z/OS® shell commands
display information on your workstation screen, standard output.
If you redirect the output, you can save the output from a command
in a file instead. The output is sent to the file rather than to the
screen. At the end of any command, enter:
>filename
For
example: cat file1 file2 file3 >outfile
writes
the contents of the three files into another file called outfile.
All the information in the original three files is concatenated into
a single file, outfile.When you redirect output with >filename and
it is an existing file, the output writes over any information that
the file already contains. To append command output at the
end of the file, use:
>>file name
instead.
For example: sort -u file1 >output 2>>outerr
redirects
the result of the sort to the file named output (instead of
standard output) and appends any error messages to the file outerr,
which is a record of errors encountered during various sorts.Suppose you entered:
sort -u filea 2>&1 >output
In
this command, you see two redirections: - Error output from the sort is redirected to standard output (
&1
), the display screen. - The result of the sort is redirected to the file named output.
Here is another example with two redirections, sending both standard
error and standard output to a file. This command produces the program hello and
a listing with error messages in a file called hello.list:
c89 -o hello -V hello.c >hello.list 2>&1;