Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Redirecting stdout problem
Top Forums Shell Programming and Scripting Redirecting stdout problem Post 302659309 by Corona688 on Wednesday 20th of June 2012 04:56:35 PM
Old 06-20-2012
The file still exists until everything with it open, closes it or quits.

Try truncating it, i.e. overwriting it with nothing, instead of deleting it. Having it open can't prevent that from happening, and tail -f is usually smart enough to seek back to the beginning.

Code:
: > filename

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

redirecting STDOUT & STDERR

In bash, I need to send the STDOUT and STDERR from a command to one file, and then just STDERR to another file. Doing one or the other using redirects is easy, but trying to do both at once is a bit tricky. Anyone have any ideas? (9 Replies)
Discussion started by: jshinaman
9 Replies

2. Shell Programming and Scripting

implicitly redirecting stdout to a file

Is there a way to redirect all stdout to a file implicitly - like defining stdout=/home/me/process.log - so that all "echo" commands in several scripts/subscripts are written to that file; instead of having to edit all scripts to redirect the "echo" (e.g. echo 'This is a test ' >>... (1 Reply)
Discussion started by: ALTRUNVRSOFLN
1 Replies

3. Shell Programming and Scripting

Redirecting part of output to stdout

Hi, I am trying to execute a command like this: find ./ -name "*.gz" -exec sh -c 'zcat {} | awk -f parse.awk' \; >> output If I want to print the filename, i generally use the -print argument to the find command but when I am redirecting the output to a file, how can I print just the... (2 Replies)
Discussion started by: Legend986
2 Replies

4. UNIX for Dummies Questions & Answers

Redirecting several outputs to /dev/stdout

I have an executable that, depending on its input, outputs to either one file or several. It usually prints nothing on screen. The usual way to call this program is to specify an input and output filenames, like this: ./executable.exe -i inputfile -o outputfileIt will then try to use the output... (1 Reply)
Discussion started by: aplaydoc
1 Replies

5. Shell Programming and Scripting

redirecting to stdout in betwen command

can anyone help me in making singleline command for Capital Letters are folders ,small letter are files X,Y,Z are subfolders of A as shown below A - X,Y,Z Folder X has three files a.txt,b.txt,c.txt similarly Y,Z. as shown below X- a.txt,b.txt,c.txt Y- a.txt,b.txt,c.txt Z-... (4 Replies)
Discussion started by: phoenix_nebula
4 Replies

6. Shell Programming and Scripting

Redirecting stdout to variable while printing it

Hi everybody, I am trying to do the thing you see in the title, and I can't simply do a=$(svn up) echo $a because the program (svn) gives output on lots of lines and in the variable the output is stored on only one line (resulting in a horribly formatted text). Any tips? Thanks,... (2 Replies)
Discussion started by: ocirne94
2 Replies

7. Shell Programming and Scripting

Redirecting stdout on background task

Hello, I have a script (videostream.sh) which invokes the GStreamer command-line tool gst-launch with all the correct command line parameters. When I invoke this program, I add the '&' character at the end to make it a background task, so that my script can complete and exit, i.e. gst-launch... (1 Reply)
Discussion started by: salukibob
1 Replies

8. Shell Programming and Scripting

Redirecting stdout continously to a file

I have a C program that continously outputs info to stdout. The problem is that I am redirecting the stdout and stderr to a file and stdout is written at the end of the problem rather than continously to the file. This could be a problem if for example the program is killed and the stdout output is... (3 Replies)
Discussion started by: igurov
3 Replies

9. Shell Programming and Scripting

Redirecting stdion, stdout within an AT command

Hello, I'm strugling with some redirecting and all help is apreciated. The following program is working as expected, but the result of the AT command doesn't go to any file. Thanks in advance for the help. #!/bin/bash modem=/dev/ttyUSB1 file=/root/imsi.txt # print error to stderr and exit... (4 Replies)
Discussion started by: cleitao
4 Replies

10. UNIX for Dummies Questions & Answers

Redirecting stdout inside a loop

hi, OK. I am writing a bash script, and it is almost working for me. Problem 1: I currently have stout sent to a file (stout.miRNA.bash.$date_formatted) which I would like to have work inside my loop, but when I move it, it just prints to the screen. Problem 2: I have a second file... (18 Replies)
Discussion started by: hmortens
18 Replies

LEARN ABOUT MOJAVE

seek

seek(n) 						       Tcl Built-In Commands							   seek(n)

__________________________________________________________________________________________________________________________________________________

NAME

       seek - Change the access position for an open channel

SYNOPSIS

       seek channelId offset ?origin?
_________________________________________________________________

DESCRIPTION

       Changes the current access position for channelId.

       ChannelId  must	be  an	identifier for an open channel such as a Tcl standard channel (stdin, stdout, or stderr), the return value from an
       invocation of open or socket, or the result of a channel creation command provided by a Tcl extension.

       The offset and origin arguments specify the position at which the next read or write will occur for channelId. Offset must  be  an  integer
       (which may be negative) and origin must be one of the following:

       start	 The new access position will be offset bytes from the start of the underlying file or device.

       current	 The  new access position will be offset bytes from the current access position; a negative offset moves the access position back-
		 wards in the underlying file or device.

       end	 The new access position will be offset bytes from the end of the file or device.  A negative offset places  the  access  position
		 before the end of file, and a positive offset places the access position after the end of file.

       The origin argument defaults to start.

       The  command  flushes  all buffered output for the channel before the command returns, even if the channel is in nonblocking mode.  It also
       discards any buffered and unread input.	This command returns an empty string.  An error occurs if this	command  is  applied  to  channels
       whose underlying file or device does not support seeking.

       Note  that  offset  values  are	byte offsets, not character offsets.  Both seek and tell operate in terms of bytes, not characters, unlike
       read.

EXAMPLES

       Read a file twice:
	      set f [open file.txt]
	      set data1 [read $f]
	      seek $f 0
	      set data2 [read $f]
	      close $f
	      # $data1 == $data2 if the file wasn't updated

       Read the last 10 bytes from a file:
	      set f [open file.data]
	      # This is guaranteed to work with binary data but
	      # may fail with other encodings...
	      fconfigure $f -translation binary
	      seek $f -10 end
	      set data [read $f 10]
	      close $f

SEE ALSO

       file(n), open(n), close(n), gets(n), tell(n), Tcl_StandardChannels(3)

KEYWORDS

       access position, file, seek

Tcl									8.1								   seek(n)
All times are GMT -4. The time now is 06:11 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy