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With this command syntax, the display screen is detached from stdout and ‘output-file’ is attached to it, i.e., ‘command’ sends output to ‘output-file’ and not the display screen.
MTH304 ASSIGNMENT 1 SOLUTION SPRING 2022
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Note that 1> operator cannot be used with the C and TC shells. Here is an example use of input redirection. In these examples, the cat, grep and find commands send their outputs to the Phone, Ali. Phones, and foo.log files, respectively, and not to the display screen.
$ cat > Phones
[ your input ]
<Ctrl-D>
$ grep “Ali” Phones > Ali.phones
[ output of grep ]
$ find ~ -name foo -print > foo.log
[ error messages ]
$
Error Redirection: Here is the syntax for error redirection: command 2> error-file With this command syntax, the display screen is detached from stderr and ‘error-file’ is attached to it, i.e., error messages are sent to ‘error-file’ and not the display screen.
Note that 2> cannot be used under C and TC shells. The following are a few examples of error redirection. In these examples, the first find command sends its error messages to the errors file and the second find command sends its error messages to the /dev/null file.