How to I pipe simple things into programs?

Nullw0rm · 2010-02-07 05:02:44

I have seen the obvious piping for things such as program | more etc. And some allow text to be piped into it, for example the TTS (text to speech) program Festival, You'd type in..

festival -tts | echo "I am going to be spoken"

But it doesn't work for any other progams.. What I want to do is for example

hexdump foo.txt  INTO -->  hexdump | echo "I am going into hexdump"

How do I pipe text into a program? Hexdump requires a file to be specified (foo.txt for example), so maybe I want it to see the echo as text. If I can't, then some programs use strings, so I could really use it for that!..

Ghost1227 · 2010-02-07 05:08:21

echo "I am going into hexdump" | hexdump

egan · 2010-02-07 05:20:38

Your examples don't make any sense... a pipe takes the stdout of the first program and uses it as the stdin of the second. What you want to do is the opposite direction as far as I can tell, which would be < when working with files... when working with regular stdout you need to reverse the pipe order as Ghost1227 posted.

sdolim · 2010-02-07 06:34:10

Some programs that require a filename will understand "-" to mean "read from stdin". Silly example:

echo hello world | cat -

In bash, you can use command substitution to make a fake file that is actually the output of your process. The filename looks like "<(command)". Silly example:

hexdump <(echo hello world)

Arch Linux

#1 2010-02-07 05:02:44

How to I pipe simple things into programs?

#2 2010-02-07 05:08:21

Re: How to I pipe simple things into programs?

#3 2010-02-07 05:20:38

Re: How to I pipe simple things into programs?

#4 2010-02-07 06:34:10

Re: How to I pipe simple things into programs?

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