[solved] bash: difference `` and $()?

Hey,
i'm new to bash scripting but I'm using both of the syntaxes `` and $() quite often and they seem to do the same thing.
I believe `` just evaluates and with $() i can do an array of evaluating sequences but i'm not sure and i didn't want to dig in too deep into some bash guides right now.
Can you tell me where the difference is?
Last edited by demian (2010-05-14 13:16:52)

Trent wrote:I don't think $() is portable outside of bash. That's what I've heard, anyway.
$() is adopted and recommended by POSIX, so protability should not be a problem.
Search for command substitution in google and see by yourself
Last edited by eirika (2010-05-14 20:24:57)

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[Solved] Bash scripting and sed substitution

Hello!
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Last edited by jiehong (2010-09-26 07:49:25)

I've implemented what Procyon told in the part 2 and it's working with a small adaptation, which is great!!
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hǎo
hào
wō wó wǒ wò wo
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hao4
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my sed ligne is now :
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[SOLVED][bash] read and tab character

Hello archers!
I'm trying to write simple script for mysql query results parsing. And I got that `read` command "eats" tab-characters:
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foo bar
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mysql -e "SELECT title,summary,body,added,modified FROM news" \
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How can I prevent such behavior?
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Last edited by pshevtsov (2012-05-23 09:42:13)

pshevtsov wrote:
So, I can't perform the following:
mysql -e "SELECT title,summary,body,added,modified FROM news" \
| while IFS=\t read TITLE SUMMARY BODY ADDED MODIFIED
do
echo $TITLE
done
How can I prevent such behavior?
Thanks!
If you want to use \t as IFS you have to quote it
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[SOLVED] Bash prompts and bell characters

Hello
This is kinda hard to explain, but I'll give a shot - with a couple of screenshots.
Notice the terminal on the left, and also at the bottom.. whenever I type in a command (or paste from somewhere) that's longer than xx characters, and hit "END" to edit the command, it goes all the way to the start of the line - but visually it's leaving the character behind, so it's impossible to see where you're editing. I suppose it has something to do with my terminal size (even tho "fullscreen" in Xmonad).
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http://codepad.org/U2VSyAUR
Thanks for any help.
Last edited by valvet (2010-11-07 18:30:05)

linux-ka wrote:That's strange. I am using xmonad and rxvt-unicode-256color too, but there's no problem. I am running the current version of both of 'em. Have you upgraded xmonad/-contrib? or try to build your rxvt version on your own machine.
Also, yes - my xmonad stuff should be up to date.
Name : xmonad-darcs
Version : 20101103-1
URL : http://hackage.haskell.org/package/xmonad
Licenses : custom:BSD3
Groups : None
Provides : None
Depends On : gmp libxinerama ghc haskell-x11>=1.5.0.0 haskell-mtl
Optional Deps : None
Required By : xmonad-contrib-darcs
Conflicts With : xmonad
Replaces : None
Installed Size : 4404.00 K
Packager : Unknown Packager
Architecture : i686
Build Date : Wed 03 Nov 2010 11:13:51 PM CET
Install Date : Wed 03 Nov 2010 11:14:03 PM CET
Install Reason : Explicitly installed
Install Script : Yes
Description : A tiling window manager
Name : xmonad-contrib-darcs
Version : 20101103-1
URL : http://hackage.haskell.org/package/xmonad-contrib
Licenses : custom:BSD3
Groups : None
Provides : None
Depends On : haskell-x11-xft xmonad-darcs
Optional Deps : None
Required By : None
Conflicts With : xmonad-contrib
Replaces : None
Installed Size : 26100.00 K
Packager : Unknown Packager
Architecture : i686
Build Date : Wed 03 Nov 2010 11:16:53 PM CET
Install Date : Wed 03 Nov 2010 11:17:21 PM CET
Install Reason : Explicitly installed
Install Script : Yes
Description : Third party extensions for xmonad
Could you try with my Xdefaults file above, see if you can reproduce it? Also try using the font I am (Droid).
Thanks
Last edited by valvet (2010-11-07 02:04:57)

SOLVED: bash upgrade, prompt issues

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export PROMPT_COMMAND
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Last edited by ptepid (2009-09-26 11:12:25)

Okay, there's something else going on here. I just happened to be messing with ANSI escape codes for something else and the same issue arose.
For instance
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1;34m Test2 (~)Test1 Test2
[ptepid@securis ~]$
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Turns out only one user is affected. I'm trying to hunt down what is causing it, but I can't find any ENV variables that are different. It's only happening in X, but it's a problem with both rxvt and rxvt-unicode.
SOLVED: Okay, now I feel pretty dumb. It was some bogus code in my .bashrc that was meant to update the titlebar of an xterm. That worked, but it also seems to mess with ANSI escape characters. This was the offending code:
if [[ -n "$DISPLAY" ]]; then
if [[ -n $MRXVT_TABTITLE ]]; then
trap 'echo -ne "\e]61;${BASH_COMMAND//\"/} (${PWD/$HOME/~})\a"' DEBUG
else
trap 'echo -ne "\e]0;${BASH_COMMAND//\"/} (${PWD/$HOME/~})\a"' DEBUG
fi
fi
A relic from when I'd used mrxvt.
Last edited by ptepid (2009-09-26 11:11:55)

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Please refer to Creative Cloud Help | Creative Cloud / Common Questions
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How to calculate difference and percentage in matrix report dynamic columns in SSRS 2008

Hi Friends,
I need to calculate Difference and Percentage In matrix report SSRS 2008
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3)Data Invnetory(Value fileld)
Example:
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Below Code is working for If two values is available.
If any one of the fiscal year week data is not there it's taking some garbage values.
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Public Shared Value1 as String
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Hi veerapaneni,
According to your description, if one of the fiscal year week doesn’t have data, the custom code returns false results.
For your requirement, if NULL value exists in the database, we should replace it as zero then perform calculate. So within the code, we should judge whether the value is NULL. To achieve your goal, please refer to the steps below:
1. Create a table like below.
create table dif4
([Product Group] varchar(50),
[Week] varchar(50),
[Fiscalyearweek] varchar(50),
value int
insert into dif4 values
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('Desktops','W01','FY15W01',45),
('Desktops','W02','FY14W02',null),
('Desktops','W02','FY15W02',30),
('Desktops','W03','FY14W03',12),
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('Notebooks','W02','FY15W02',87),
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If Value1=0 Then
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End Function
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4. Then get the expected results.<o:p></o:p>
If you have any question, please feel free to ask.
Best regards,
Qiuyun Yu
Qiuyun Yu
TechNet Community Support

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I have Arch64 with Opera 64-bit as default browser. I have succesfully installed 32-bit flashplugin and it works nicely. The only problem is that fonts cannot be read from the flash player context menu and Open File dialog opened from flash player. The problem is that flashplugin tries to load 64-bit GTK from /usr/lib/gtk-2.0/2.10.0/ and it fails. 32-bit version is installed and it's located in /opt/lib32/usr/lib/gtk-2.0/2.10.0/.
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libtotem-plparser-mini.so.10 => /usr/lib/libtotem-plparser-mini.so.10 (0x00007f94e17d6000)
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I think that symbolic links and moving files are not the most elegant way to solve the problem. Maybe some environment variable or some configuration setting would solve the problem (LDPATH comes to mind, but it seems that it doesn't work).
EDIT: I wasn't sure in which section to post this question, so feel free to move it if necessary.
Last edited by SnapShot (2008-09-12 02:50:01)

I have solved my problem and I will post my solution because it can be usefull to others.
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case "$wrapper" in
*ia32*)
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esac
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[SOLVED] Bash coloured prompt issues

Hi, I'm having trouble with my bash prompt and after going through a sea of posts on prompts I can't seem to figure out why mine isn't giving the desired behaviour.
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WHITEBOLD='\[\e[1;37m'
WHITE='\[\e[0;37m'
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The desired output:
[will 06:48 PM (master) > ~/.vim] $
When I scroll through the history the prompt messes up and starts looking like this:
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Last edited by will.price94 (2012-02-27 21:02:26)

The prompt counts your color sequences as characters which messes up the cursor position. Escape the ${WHITE} and ${YELLOW} etc. by putting them between \[ \] like this: \[${WHITE}\] . In your case, include the closing \] when you define the color variables, so
YELLOW='\[\e[0;33m\]' so you don't have to worry about them in the PS1= sequence.
Edit: try like this (maybe remove some spaces, haven't tried the prompt myself)
YELLOW='\[\e[0;33m\]'
WHITEBOLD='\[\e[1;37m\]'
WHITE='\[\e[0;37m\]'
ORANGE='\[\e[1;31m\]'
PS1="${WHITE}[${ORANGE}\u ${YELLOW}\@ ${WHITEBOLD}\$(parse_git_branch) ${ORANGE}> ${YELLOW}\w${WHITE}] \$"
Last edited by VCoolio (2012-02-27 20:26:34)

[solved] bash: difference `` and $()?

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