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Shell Programming and Scripting
/dev/null what is the use of it?
Post 302211323 by webmunkey23 on Thursday 3rd of July 2008 05:26:04 AM
07-03-2008
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Maybe it's an stupid question but remeber... I'm Junior..
I use command line to run programs, and some of them gives a lot of information when, for example, you open a window or other actions. That's really bad because my terminal gets full of unwanted messages, so I use "bin file & >/dev/null"... (1 Reply)
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Hi ,
I am importing some table from /dev/null i dont understand what is /dev/null
Sorry i am new to UNIX
sam71 (3 Replies)
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Hi,
Q1-What does
nroff -ms > /dev/null
Q2- What does mean -A under STAT column :
ps aux |head -20
UTIL PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
root 516 93,0 0,0 12 12 - A 04 nov 3906:51 wait
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hello all,
In many shell scripts i found '> /dev/null' , i am not able to get this,
will any one please explain why we are using this.
thanks
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Hi, Anyone can help
My solaris 8 system has the following
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Hi expert,
May I know what is the difference between below cron tab entry ?
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How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&"
echo "hello" > /dev/null 2>&1
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I apologize if this question has been answered else where or is too elementary.
I ran across a KSH script (long unimportant story) that does this:
if ; then
CAS_SRC_LOG="/var/log/cas_src.log 2>&1"
else
CAS_SRC_LOG="/dev/null 2>&1"
fithen does this:
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Hello All and a Happy New year to yous guys.
I'm running the below command on my AIX box and it keeps giving me the message that the file doesn't exist. I know the file don't exist, but I don't want to see the error. 2>/dev/null doesn't work.
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Friends have the following problem
a search may not find anything which would correct example:
ls -ltr *prueba.txt | nawk '{ print $9 }' > Procesar.dat 2>/dev/null
When he finds nothing gives me the following error
ls: prueba.txt: No such file or directory
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LEARN ABOUT LINUX
dminfo
dminfo(1M) System Administration Commands dminfo(1M) NAME
dminfo - report information about a device entry in a device maps file SYNOPSIS
dminfo [-v] [-a] [-f pathname] dminfo [-v] [-a] [-f pathname] -n dev -name... dminfo [-v] [-a] [-f pathname] -d dev -path... dminfo [-v] [-a] [-f pathname] -t dev -type... dminfo [-v] [-f pathname] -u dm -entry DESCRIPTION
dminfo reports and updates information about the device_maps(4) file. OPTIONS
The following options are supported -a Succeed if any of the requested entries are found. If used with -v, all entries that match the requested case(s) are printed. -d dev-path Search by dev-path. Search device_maps(4) for a device special pathname in the device_list field matching the dev-path argument. This option cannot be used with -n, -t or -u. -f pathname Use a device_maps file with pathname instead of /etc/security/device_maps. -n dev-name Search by dev-name. Search device_maps(4) for a device_name field matching dev-name. This option cannot be used with -d, -t or -u. -t dev-type Search by dev-type. Search device_maps(4) for a device_type field matching the given dev-type. This option cannot be used with -d, -n or -u. -u dm-entry Update the device_maps(4) file. This option is provided to add entries to the device_maps(4) file. The dm-entry must be a complete device_maps(4) file entry. The dm-entry has fields, as in the device_maps file. It uses the colon (:) as a field separator, and white space as the device_list subfield separators. The dm-entry is not made if any fields are missing, or if the dm-entry would be a duplicate. The default device maps file can be updated only by the super user. -v Verbose. Print the requested entry or entries, one line per entry, on the standard output. If no entries are speci- fied, all are printed. EXIT STATUS
0 Successful completion. 1 Request failed. 2 Incorrect syntax. FILES
/etc/security/device_maps ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
bsmconv(1M), device_maps(4), attributes(5) NOTES
The functionality described in this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for more information. SunOS 5.10 6 May 1993 dminfo(1M)