tcsh - understanding difference between "echo string" and "echo string > /dev/stdout"
I came across and unexpected behavior with redirections in tcsh. I know, csh is not best for redirections, but I'd like to understand what is happening here.
I have following script (called out_to_streams.csh):
When I pipe the output like this:
I get "Redirect to STDOUT" and "Should default to STDOUT without redirection" being piped.
When I redirect to a file:
the shell shows "Redirected to STDERR" as expected
mystdout only contains "Should default to STDOUT without redirection"
"Redirected to STDOUT" is totally missing
Anyone can explain what happens to "Redirected to STDOUT"?
Hi,
I've modified the syslogd source to include a thread that will keep track of a timer(or a timer thread). My intention is to check the file size of /var/log/messages in every one minute & if the size is more than 128KB, do a echo " " > /var/log/messages, so that the file size will be set... (7 Replies)
So in my shell i execute:
{ while true; do echo string; sleep 1; done } | read line This waits one second and returns.
But
{ while true; do /bin/echo string; sleep 1; done } | read line continues to run, and doesn't stop until i kill it explicitly.
I have tried this in bash as well as zsh,... (2 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Hello everyone
Sorry I have to add another sed question. I am searching a log file and need only the first 2 occurances of text which comes after (note the space) "string " and before a ",". I have tried
sed -n 's/.*string \(*\),.*/\1/p' filewith some, but limited success. This gives out all... (10 Replies)
Hi Folks,
As per the subject, the following command is not working as expected.
echo $variable | mail -s "subject" "xxx@xxx.com"
Could anyone figure it out whats wrong with this. I am using AIX box.
Regards, (2 Replies)
logs:
"/home/abc/public_html/index.php"
"/home/abc/public_html/index.php"
"/home/xyz/public_html/index.php"
"/home/xyz/public_html/index.php"
"/home/xyz/public_html/index.php"
how to use "cut" or "awk" or "sed" to get the following result:
abc
abc
xyz
xyz
xyz (8 Replies)
Hello.
Following recommendations for one of my threads, this is working perfectly :
#!/bin/bash
CNT=$( grep -c -e "some text 1" -e "some text 2" -e "some text 3" "/tmp/log_file.txt" )
Now I need a grep success for some thing like :
#!/bin/bash
CNT=$( grep -c -e "some text_1... (4 Replies)
I use below code to get ip, and I want to echo something in the function, but the $IP will be all the value from "echo" I just want to get the real ip, and keep the echo info, any help
#!/bin/bash
get_ip()
{
ip=$(grep -B2 "00:01:02:03:04:05" ip_tmp.log |head -1 |awk '{print $2}')
... (4 Replies)
Dear Ladies & Gents,
I have a requirement to delete all the log files in /var/log/test directory that are older than 10 days and their first line begin with "MSH" or "<?xml" or "FHS". I've put together the following BASH script, but it's erroring out:
for filename in $(find /var/log/test... (2 Replies)
Discussion started by: Hiroshi
2 Replies
LEARN ABOUT DEBIAN
fastq_quality_trimmer
FASTQ_QUALITY_TRIMMER(1) User Commands FASTQ_QUALITY_TRIMMER(1)NAME
fastq_quality_trimmer - Filters sequences based on quality
DESCRIPTION
usage: fastq_quality_trimmer [-h] [-v] [-t N] [-l N] [-z] [-i INFILE] [-o OUTFILE] Part of FASTX Toolkit 0.0.13.1 by A. Gordon (gor-
don@cshl.edu)
[-h] = This helpful help screen.
[-t N] = Quality threshold - nucleotides with lower
quality will be trimmed (from the end of the sequence).
[-l N] = Minimum length - sequences shorter than this (after trimming)
will be discarded. Default = 0 = no minimum length.
[-z] = Compress output with GZIP.
[-i INFILE]
= FASTQ input file. default is STDIN.
[-o OUTFILE] = FASTQ output file. default is STDOUT. [-v] = Verbose - report number of sequences.
If [-o] is specified,
report will be printed to STDOUT.
If [-o] is not specified (and output goes to STDOUT), report will be printed to STDERR.
SEE ALSO
The quality of this automatically generated manpage might be insufficient. It is suggested to visit
http://hannonlab.cshl.edu/fastx_toolkit/commandline.html
to get a better layout as well as an overview about connected FASTX tools.
fastq_quality_trimmer 0.0.13.1 April 2012 FASTQ_QUALITY_TRIMMER(1)