PowerPoint Presentation

ĄPipes and Redirection

> : redirect program output (stdout) to a file

e.g. waver -help > waver.help

waver -pickle > waver.help

>& : redirect all output (both stdout and stderr) to a file

e.g. waver -pickle >& waver.pickle

e.g. tcsh my.script >& script.output

>> : append program output to a file

| : pipe standard output to the input of another program

e.g. 3dDeconvolve -help | less

|& : include stderr in the pipe

e.g. tcsh my.big.script |& tee script.output

Ąrun the script

Ąsend all output to the tee program

Ąthe tee program duplicates the input, sending the output to both the terminal and the given file (script.output)

Ąyou can see the output, but it is also stored for future analysis