|
|
Sponsored Content
Top Forums
UNIX for Dummies Questions & Answers
cat /dev/null
Post 302234871 by fulltoo on Wednesday 10th of September 2008 03:34:11 PM
09-10-2008
|
|
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
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)
Discussion started by: piltrafa
1 Replies
2. UNIX for Dummies Questions & Answers
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)
Discussion started by: sam71
3 Replies
3. UNIX for Advanced & Expert Users
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
Thank you. (4 Replies)
Discussion started by: big123456
4 Replies
4. Shell Programming and Scripting
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
sudha (2 Replies)
Discussion started by: rrs
2 Replies
5. Solaris
Hi, Anyone can help
My solaris 8 system has the following
/dev/null , /dev/tty and /dev/console
All permission are lrwxrwxrwx
Can this be change to a non-world write ??
any impact ?? (12 Replies)
Discussion started by: civic2005
12 Replies
6. Shell Programming and Scripting
Hi expert,
May I know what is the difference between below cron tab entry ?
0,12 * * * * /abc/myscript.sh > /dev/null 2>&1
0,12 * * * * /abc/myscript.sh (7 Replies)
Discussion started by: olaris
7 Replies
7. Shell Programming and Scripting
when do you use the path /dev/null (3 Replies)
Discussion started by: webmunkey23
3 Replies
8. Shell Programming and Scripting
Hello,
I'm trying to send the error output of a 'cat' operation to /dev/null like this:
cat /dirA/dirB/temp*.log > /dirA/dirB/final.log 2>/dev/null
This works perfectly in a terminal, but not when placed in a script.
If there are no files matching temp*.log the script outputs an error... (7 Replies)
Discussion started by: Nils88
7 Replies
9. UNIX for Dummies Questions & Answers
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
echo "hello" > /dev/null 2>1 (3 Replies)
Discussion started by: glev2005
3 Replies
10. Shell Programming and Scripting
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:
/usr/bin/echo "heartbeat:... (5 Replies)
Discussion started by: jbmorrisonjr
5 Replies
LEARN ABOUT OSX
ansi_cctrl
term::ansi::code::ctrl(n) Terminal control term::ansi::code::ctrl(n) _________________________________________________________________ NAME
term::ansi::code::ctrl - ANSI control sequences SYNOPSIS
package require Tcl 8.4 package require term::ansi::code ?0.1? package require term::ansi::code::ctrl ?0.1.1? ::term::ansi::code::ctrl::names ::term::ansi::code::ctrl::import ?ns? ?arg...? ::term::ansi::code::ctrl::eeol ::term::ansi::code::ctrl::esol ::term::ansi::code::ctrl::el ::term::ansi::code::ctrl::ed ::term::ansi::code::ctrl::eu ::term::ansi::code::ctrl::es ::term::ansi::code::ctrl::sd ::term::ansi::code::ctrl::su ::term::ansi::code::ctrl::ch ::term::ansi::code::ctrl::sc ::term::ansi::code::ctrl::rc ::term::ansi::code::ctrl::sca ::term::ansi::code::ctrl::rca ::term::ansi::code::ctrl::st ::term::ansi::code::ctrl::ct ::term::ansi::code::ctrl::cat ::term::ansi::code::ctrl::qdc ::term::ansi::code::ctrl::qds ::term::ansi::code::ctrl::qcp ::term::ansi::code::ctrl::rd ::term::ansi::code::ctrl::elw ::term::ansi::code::ctrl::dlw ::term::ansi::code::ctrl::eg ::term::ansi::code::ctrl::lg ::term::ansi::code::ctrl::scs0 tag ::term::ansi::code::ctrl::scs1 tag ::term::ansi::code::ctrl::sda arg... ::term::ansi::code::ctrl::sda_fgblack ::term::ansi::code::ctrl::sda_fgred ::term::ansi::code::ctrl::sda_fggreen ::term::ansi::code::ctrl::sda_fgyellow ::term::ansi::code::ctrl::sda_fgblue ::term::ansi::code::ctrl::sda_fgmagenta ::term::ansi::code::ctrl::sda_fgcyan ::term::ansi::code::ctrl::sda_fgwhite ::term::ansi::code::ctrl::sda_fgdefault ::term::ansi::code::ctrl::sda_bgblack ::term::ansi::code::ctrl::sda_bgred ::term::ansi::code::ctrl::sda_bggreen ::term::ansi::code::ctrl::sda_bgyellow ::term::ansi::code::ctrl::sda_bgblue ::term::ansi::code::ctrl::sda_bgmagenta ::term::ansi::code::ctrl::sda_bgcyan ::term::ansi::code::ctrl::sda_bgwhite ::term::ansi::code::ctrl::sda_bgdefault ::term::ansi::code::ctrl::sda_bold ::term::ansi::code::ctrl::sda_dim ::term::ansi::code::ctrl::sda_italic ::term::ansi::code::ctrl::sda_underline ::term::ansi::code::ctrl::sda_blink ::term::ansi::code::ctrl::sda_revers ::term::ansi::code::ctrl::sda_hidden ::term::ansi::code::ctrl::sda_strike ::term::ansi::code::ctrl::sda_nobold ::term::ansi::code::ctrl::sda_noitalic ::term::ansi::code::ctrl::sda_nounderline ::term::ansi::code::ctrl::sda_noblink ::term::ansi::code::ctrl::sda_norevers ::term::ansi::code::ctrl::sda_nohidden ::term::ansi::code::ctrl::sda_nostrike ::term::ansi::code::ctrl::sda_reset ::term::ansi::send::fcp row col ::term::ansi::code::ctrl::cu ?n? ::term::ansi::code::ctrl::cd ?n? ::term::ansi::code::ctrl::cf ?n? ::term::ansi::code::ctrl::cb ?n? ::term::ansi::code::ctrl::ss ?s e? ::term::ansi::code::ctrl::skd code str ::term::ansi::code::ctrl::title str ::term::ansi::code::ctrl::gron ::term::ansi::code::ctrl::groff ::term::ansi::code::ctrl::tlc ::term::ansi::code::ctrl::trc ::term::ansi::code::ctrl::brc ::term::ansi::code::ctrl::blc ::term::ansi::code::ctrl::ltj ::term::ansi::code::ctrl::ttj ::term::ansi::code::ctrl::rtj ::term::ansi::code::ctrl::btj ::term::ansi::code::ctrl::fwj ::term::ansi::code::ctrl::hl ::term::ansi::code::ctrl::vl ::term::ansi::code::ctrl::groptim str ::term::ansi::code::ctrl::clear ::term::ansi::code::ctrl::init ::term::ansi::code::ctrl::showat row col text _________________________________________________________________ DESCRIPTION
This package provides symbolic names for the ANSI control sequences. For each sequence a single command is provided which returns the sequence as its result. None of the commands of this package write to a channel; that is handled by higher level packages, like term::ansi::send. API
INTROSPECTION ::term::ansi::code::ctrl::names This command is for introspection. It returns as its result a list containing the names of all attribute commands. ::term::ansi::code::ctrl::import ?ns? ?arg...? This command imports some or all attribute commands into the namespace ns. This is by default the namespace ctrl. Note that this is relative namespace name, placing the imported command into a child of the current namespace. By default all commands are imported, this can howver be restricted by listing the names of the wanted commands after the namespace argument. SEQUENCES ::term::ansi::code::ctrl::eeol Erase (to) End Of Line ::term::ansi::code::ctrl::esol Erase (to) Start Of Line ::term::ansi::code::ctrl::el Erase (current) Line ::term::ansi::code::ctrl::ed Erase Down (to bottom) ::term::ansi::code::ctrl::eu Erase Up (to top) ::term::ansi::code::ctrl::es Erase Screen ::term::ansi::code::ctrl::sd Scroll Down ::term::ansi::code::ctrl::su Scroll Up ::term::ansi::code::ctrl::ch Cursor Home ::term::ansi::code::ctrl::sc Save Cursor ::term::ansi::code::ctrl::rc Restore Cursor (Unsave) ::term::ansi::code::ctrl::sca Save Cursor + Attributes ::term::ansi::code::ctrl::rca Restore Cursor + Attributes ::term::ansi::code::ctrl::st Set Tab (@ current position) ::term::ansi::code::ctrl::ct Clear Tab (@ current position) ::term::ansi::code::ctrl::cat Clear All Tabs ::term::ansi::code::ctrl::qdc Query Device Code ::term::ansi::code::ctrl::qds Query Device Status ::term::ansi::code::ctrl::qcp Query Cursor Position ::term::ansi::code::ctrl::rd Reset Device ::term::ansi::code::ctrl::elw Enable Line Wrap ::term::ansi::code::ctrl::dlw Disable Line Wrap ::term::ansi::code::ctrl::eg Enter Graphics Mode ::term::ansi::code::ctrl::lg Exit Graphics Mode ::term::ansi::code::ctrl::scs0 tag Set default character set ::term::ansi::code::ctrl::scs1 tag Set alternate character set Select Character Set. Choose which character set is used for either default (scs0) or alternate font (scs1). This does not change whether default or alternate font are used, only their definition. The legal tags, and their meanings, are: A United Kingdom Set B ASCII Set 0 Special Graphics 1 Alternate Character ROM Standard Character Set 2 Alternate Character ROM Special Graphics ::term::ansi::code::ctrl::sda arg... Set Display Attributes. The arguments are the code sequences for the possible attributes, as provided by the package term::ansi::code::attr. For convenience this package also provides additional commands each setting a single specific attribute. ::term::ansi::code::ctrl::sda_fgblack Set text color to Black. ::term::ansi::code::ctrl::sda_fgred Set text color to Red. ::term::ansi::code::ctrl::sda_fggreen Set text color to Green. ::term::ansi::code::ctrl::sda_fgyellow Set text color to Yellow. ::term::ansi::code::ctrl::sda_fgblue Set text color to Blue. ::term::ansi::code::ctrl::sda_fgmagenta Set text color to Magenta. ::term::ansi::code::ctrl::sda_fgcyan Set text color to Cyan. ::term::ansi::code::ctrl::sda_fgwhite Set text color to White. ::term::ansi::code::ctrl::sda_fgdefault Set default text color (Black). ::term::ansi::code::ctrl::sda_bgblack Set background to Black. ::term::ansi::code::ctrl::sda_bgred Set background to Red. ::term::ansi::code::ctrl::sda_bggreen Set background to Green. ::term::ansi::code::ctrl::sda_bgyellow Set background to Yellow. ::term::ansi::code::ctrl::sda_bgblue Set background to Blue. ::term::ansi::code::ctrl::sda_bgmagenta Set background to Magenta. ::term::ansi::code::ctrl::sda_bgcyan Set background to Cyan. ::term::ansi::code::ctrl::sda_bgwhite Set background to White. ::term::ansi::code::ctrl::sda_bgdefault Set default background (Transparent). ::term::ansi::code::ctrl::sda_bold Bold on. ::term::ansi::code::ctrl::sda_dim Dim on. ::term::ansi::code::ctrl::sda_italic Italics on. ::term::ansi::code::ctrl::sda_underline Underscore on. ::term::ansi::code::ctrl::sda_blink Blink on. ::term::ansi::code::ctrl::sda_revers Reverse on. ::term::ansi::code::ctrl::sda_hidden Hidden on. ::term::ansi::code::ctrl::sda_strike Strike-through on. ::term::ansi::code::ctrl::sda_nobold Bold off. ::term::ansi::code::ctrl::sda_noitalic Italics off. ::term::ansi::code::ctrl::sda_nounderline Underscore off. ::term::ansi::code::ctrl::sda_noblink Blink off. ::term::ansi::code::ctrl::sda_norevers Reverse off. ::term::ansi::code::ctrl::sda_nohidden Hidden off. ::term::ansi::code::ctrl::sda_nostrike Strike-through off. ::term::ansi::code::ctrl::sda_reset Reset all attributes to their default values. ::term::ansi::send::fcp row col Force Cursor Position (aka Go To). ::term::ansi::code::ctrl::cu ?n? Cursor Up. n defaults to 1. ::term::ansi::code::ctrl::cd ?n? Cursor Down. n defaults to 1. ::term::ansi::code::ctrl::cf ?n? Cursor Forward. n defaults to 1. ::term::ansi::code::ctrl::cb ?n? Cursor Backward. n defaults to 1. ::term::ansi::code::ctrl::ss ?s e? Scroll Screen (entire display, or between rows start end, inclusive). ::term::ansi::code::ctrl::skd code str Set Key Definition. ::term::ansi::code::ctrl::title str Set the terminal title. ::term::ansi::code::ctrl::gron Switch to character/box graphics. I.e. switch to the alternate font. ::term::ansi::code::ctrl::groff Switch to regular characters. I.e. switch to the default font. ::term::ansi::code::ctrl::tlc Character graphics, Top Left Corner. ::term::ansi::code::ctrl::trc Character graphics, Top Right Corner. ::term::ansi::code::ctrl::brc Character graphics, Bottom Right Corner. ::term::ansi::code::ctrl::blc Character graphics, Bottom Left Corner. ::term::ansi::code::ctrl::ltj Character graphics, Left T Junction. ::term::ansi::code::ctrl::ttj Character graphics, Top T Junction. ::term::ansi::code::ctrl::rtj Character graphics, Right T Junction. ::term::ansi::code::ctrl::btj Character graphics, Bottom T Junction. ::term::ansi::code::ctrl::fwj Character graphics, Four-Way Junction. ::term::ansi::code::ctrl::hl Character graphics, Horizontal Line. ::term::ansi::code::ctrl::vl Character graphics, Vertical Line. ::term::ansi::code::ctrl::groptim str Optimize character graphics. The generator commands above create way to many superfluous commands shifting into and out of the graphics mode. This command removes all shifts which are not needed. To this end it also knows which characters will look the same in both modes, to handle strings created outside of this package. ::term::ansi::code::ctrl::clear Clear screen. In essence a sequence of CursorHome + EraseDown. ::term::ansi::code::ctrl::init Initialize default and alternate fonts to ASCII and box graphics. ::term::ansi::code::ctrl::showat row col text Format the block of text for display at the specified location. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
ansi, attribute control, color control, control, terminal COPYRIGHT
Copyright (c) 2006-2008 Andreas Kupries <andreas_kupries@users.sourceforge.net> term 0.1 term::ansi::code::ctrl(n)