io redirection is the process of changing where the output and input of a program originate
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vote
1answer
375 views
Splitting stdin to different outputs in bash [duplicate]
Possible Duplicate:
Is there a way in bash to redirect output and still have it go to stdout?
How would I send /dev/stdin to both /dev/stdout and a $logfile in one command?
One solution ...
5
votes
2answers
2k views
Write to a file without redirection?
I am writing a regular compiled application that needs to create a special file and write a magic cookie into it. I can’t write the file directly from the application, the system security model ...
4
votes
3answers
3k views
Pass xargs argument as a string to another command with '>'?
Suppose I have a bunch of files in /tmp/.
I do
find . -type f | xargs -iFILES
And I want to do a md5sum in each file, outputting to a file with the same name, but with .md5 extension.
find . ...
5
votes
4answers
3k views
How to redirect stderr,out to different files and also display in terminal?
To make it clear,
I want to see the output of a command in the terminal as if there were no redirection.
Also stderr need to be redirected to err.log and stdout need to be redirected to stdout.log.
...
6
votes
1answer
1k views
Iterate over the output of a command in bash without a subshell
I want to loop over the output of a command without creating a sub-shell or using a temporary file.
The initial version of of my script looked like this, but this doesn't work since it creates a ...
7
votes
3answers
847 views
Can I make `cut` change a file in place?
The man page doesn't give me much hope, but I'm hoping it's an undocumented (and/or GNU-specific) feature.
1
vote
3answers
439 views
How do I use redirection with sudo [duplicate]
Possible Duplicate:
Redirecting stdout to a file you don't have write permission on
Yeah I could (and probably will) just escalate to root, but I'd like to know why this doesn't work?
...
1
vote
2answers
1k views
How to insert text into a root-owned file using sudo? [duplicate]
Possible Duplicate:
Redirecting stdout to a file you don't have write permission on
Running a command like sudo echo 'text' >> /file.txt fails with:
bash: /file.txt: Permission ...
14
votes
1answer
1k views
Is there a way in bash to redirect output and still have it go to stdout?
Okay. If I wanted to redirect the output of a program to a file, I'd do something like this
prog > file
If I wanted to redirect both stdout and stderr to that file, then I'd do
prog > file ...
8
votes
1answer
298 views
redirection to cd command
is it possible to redirection the output of a command to "cd"? For example, I have searched for a directory using locate and got the path to it. Now, instead of writing cd path, can I redirect the ...
3
votes
4answers
300 views
Is there a way to redirect a file that is written
I have an application which I can not change, that writes to a big 250 GB plain text file. After compressing with GZ it is only 30 GB.
This application has no option of compressing it's output, and ...
17
votes
7answers
11k views
How to grep standard error stream (stderr)?
I am using ffmpeg to get the meta info of an audio clip. But I am unable to grep it.
$ ffmpeg -i 01-Daemon.mp3 |grep -i Duration
FFmpeg version SVN-r15261, Copyright (c) 2000-2008 Fabrice ...
4
votes
2answers
498 views
RS232 chat. Simplest way?
I'm working in a project in which I will have to deal with serial communications. For testing, I want make to 2 computers speak to each other (with my interaction) via RS232.
Will the next thing ...
12
votes
3answers
6k views
How to redirect output of wget as input to unzip?
I have to download a file from this link. The file download is a zip file which I will have to unzip in the current folder.
Normally, I would download it first, then run the unzip command.
$ wget ...
2
votes
1answer
328 views
How can I suppress unneeded output from emacsclient?
I use emacs fairly regularly and am trying to configure my system to use emacsclient when possible. To do this I have done the following:
In .bashrc:
EDITOR='emacsclient -ca emacs'
...
6
votes
3answers
3k views
Redirect stdout over ssh
I would like to run
something > file
on a remote system through ssh, but if I run
ssh host something > file
the redirection is executed locally as ssh etc > file
I've tried it with ' ...
14
votes
3answers
2k views
How to redirect output of a running program to /dev/null
I know that in order to suppress the output of a program I can redirect it to /dev/null, for example to hide all error and warning messages from chromium I can start the program like this
...
23
votes
4answers
2k views
Redirecting stdout to a file you don't have write permission on
When you attempt to modify a file without having write permissions on it, you get an error:
> touch /tmp/foo && sudo chown root /tmp/foo
> echo test > /tmp/foo
zsh: permission ...
9
votes
5answers
1k views
Using text from previous commands' output
I know this is not how terminals work, but I find myself often wishing there was an easy way of using text (copying it, modifying it, etc) that is already on my terminal window history from some ...
