bash: how to flush the output from command `tee`
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From: lihao on 25 Mar 2010 15:21 Below is my pipe line under bash(RHEL5): /path/to/my_script.sh 2>/dev/null | tee /path/to/log_file I want to check the output from script '/path/to/my_script.sh' immediately without having to wait for the buffer to be full. Is there any bash configuration to handle this and only to this script [not to the whole bash environment]. BTW. most of the output in the script "/path/to/my_script.sh" are from the 'echo' command. Thanks in advance, lihao
From: pk on 25 Mar 2010 15:17 lihao wrote: > Below is my pipe line under bash(RHEL5): > > /path/to/my_script.sh 2>/dev/null | tee /path/to/log_file > > I want to check the output from script '/path/to/my_script.sh' > immediately without having to wait for the buffer to be full. Is there > any bash configuration to handle this and only to this script [not to > the whole bash environment]. > > BTW. most of the output in the script "/path/to/my_script.sh" are from > the 'echo' command. Try man stdbuf there is an example similar to yours near the end.
From: Janis Papanagnou on 25 Mar 2010 15:31 lihao wrote: > Below is my pipe line under bash(RHEL5): > > /path/to/my_script.sh 2>/dev/null | tee /path/to/log_file > > I want to check the output from script '/path/to/my_script.sh' > immediately without having to wait for the buffer to be full. Is there > any bash configuration to handle this and only to this script [not to > the whole bash environment]. In bash; not that I know of. I use a pty. If you like, have a look at the book "Advanced Programming in the UNIX Environment". The source code of the pty program from the book are available online. Google for it. Janis > > BTW. most of the output in the script "/path/to/my_script.sh" are from > the 'echo' command. > > Thanks in advance, > lihao
From: Sidney Lambe on 25 Mar 2010 16:06 On comp.unix.shell, lihao <lihao0129(a)gmail.com> wrote: > Below is my pipe line under bash(RHEL5): > > /path/to/my_script.sh 2>/dev/null | tee /path/to/log_file > > I want to check the output from script '/path/to/my_script.sh' > immediately without having to wait for the buffer to be full. Is there > any bash configuration to handle this and only to this script [not to > the whole bash environment]. > > BTW. most of the output in the script "/path/to/my_script.sh" are from > the 'echo' command. > > Thanks in advance, > lihao Maybe you could have those echos in the script also echo to, say, /dev/pts/4 At the prompt, from /dev/pts/5: echo -e "\n\nfoo\n" > /dev/pts/4 Output at /dev/pts/4 root:/root: $ foo Ctrl-c to exit. Sid
From: Sidney Lambe on 25 Mar 2010 16:35
On comp.unix.shell, Sidney Lambe <sidneylambe(a)nospam.invalid> wrote: > On comp.unix.shell, lihao <lihao0129(a)gmail.com> wrote: >> Below is my pipe line under bash(RHEL5): >> >> /path/to/my_script.sh 2>/dev/null | tee /path/to/log_file >> >> I want to check the output from script '/path/to/my_script.sh' >> immediately without having to wait for the buffer to be full. Is there >> any bash configuration to handle this and only to this script [not to >> the whole bash environment]. >> >> BTW. most of the output in the script "/path/to/my_script.sh" are from >> the 'echo' command. >> >> Thanks in advance, >> lihao > > Maybe you could have those echos in the script also echo to, > say, /dev/pts/4 > > At the prompt, from /dev/pts/5: > > echo -e "\n\nfoo\n" > /dev/pts/4 > > Output at /dev/pts/4 > > root:/root: > $ > > foo > > > > Ctrl-c to exit. > > Sid Wait a second. They are already echoing to whatever pty you are running the script from. Where else? I guess I'm not following this and should just shut up. Sid |