Bash script read input and feh

I was trying to make a quick script to organize some pictures using feh to display the picture in question and then using bash to read a character from the keyboard and move to a folder based on that letter. Problem is it opens every image in the folder at the start (which is overwhelming). I want to go image by image.
heres the simplified script. There would be different if statements for each letter/dir pair
#!/bin/bash
ls | while read file1; do #while loop over all images in the dir
feh $file1 &
read ch1
if [[ $ch1 == "e" ]]
then
mv $file1 /PATH/hawaii
echo "moving to hawaii"
pkill feh
fi
Problem seems to be that the script doesn't wait to receive the input $ch1 before moving on to the next iteration of the loop. Except that when I do something simpler like the following it does seem to wait on the input
while
echo '1'
read ch1
echo '2'
echo '3'

for f in *; do $(feh $f)& read g; if [[ "$g" == "e" ]]; then mv -v $f ../tested; fi;pkill feh; done;
waits for me to enter something before checking whether to move the image and closing the image and moving to the next.

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Bash script user input and revision technique requested

In a bash script, I have a need to present the contents of a variable to the user, so that he can "revise" the value if needed, or just hit enter if no revision is required. The objective is to reduce keyboard effort to just revising a presented value.
The "hit enter to continue" part is easy.
The "revise" part is the problem for me.
To illustrate using an example:
#! /bin/bash
position_var=30.39
echo -n "Revise Position if required:${position_var}"
#then some kind of read position_var ??
How can I make the position_var available to the user to edit and resubmit?
Thanks
steve.
Last edited by stevepa (2012-02-28 17:31:56)

The above solution is good okay for a general shell script, bash has a feature for what you want though. (see below)
If however the content of the variable is bigger (multiple lines, or a really LONG line you don't want to have to retype), you have 2 options:
Write it to a temp file and fire up $EDITOR (if that's not set, you can default to nano or vi, whichever you can find with $(which ...)).
The other idea that comes to mind is using 'expect' to present a prefilled prompt the user can edit... I'll have to test this...
EDIT: Can't think of an easy way to do that with expect... mhh...
EDIT2: Specifically for bash:
read -p "Revise Position if required: " -i "$current" -e new
with the -e flag, $current will be what the line is prefilled with, and $new will contain the result.
Last edited by Blµb (2012-02-28 18:14:55)

My first bash script - update mirrors and then update your system.

Like the title says, this is my first attempt at a bash script.
I wrote it to make it a tiny bit easier for my wife to keep her system up to date without needing to remember the terminal commands. She runs it via an entry in her openbox menu.
It calls on reflector to check all available mirrors for the most up to date and then use rankmirrors to find the fastest 5 and write them to /etc/pacmand.d/mirrorlist
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echo "I'm afraid I can't do that Dave"
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echo " "
sleep 2s
# updates system
sudo pacman -Syyu

I've scavenged some code to take care of the root thing, but why rebase vs pacman? After reading up on rebase a bit, I'm not quite sure how to use it to complete the upgrade once it's updated everything.

Differences in writting bash-script in Solaris and in RHEL?

I wrote a script 'checkinstall' as follow and it works fine by RHEL:
[code]
#!/bin/sh
HOSTNAME=hostname
echo $HOSTNAME
if [ $HOSTNAME == "S001AP99-TEST" ]; then
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fi
exit 0
[/code]
But when I run this by Solaris I got:
# ./checkinstall
hostname
./checkinstall: test: unknown operator ==
I changed the line HOSTNAME=hostname to HOSTNAME=`hostname` and it outputs the correct hostname.
But I still get error:
# ./checkinstall
S001AP99-TEST
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If you want to create bash scripts, then the first step is to set the right shell in the first line => #!/bin/bash
Then, after this important step, you can try if this works. Oh surprise, it's working.

Bash script "open terminal and launch command

I need a script to do this:
launch a terminal, from this change working directory and then launch a command; the terminal have to remain opened after the command execution.
Something like:
$terminal cd $dir && $command
If I open a terminal and I do:
cd $dir && $command
it works
If I do a .sh script with this:
xterm -hold -e cd $dir && $command
or
terminal -H -x cd $dir && $command
when I launch it (the script) it doesn't work.
Last edited by buntolo (2012-01-05 23:44:52)

karol wrote:
xterm -hold -e "cd ~/test/ && ls"
works too.
I don't know what $command do you mean, but this will list th ~/test directory.
It works also for me.
With urxvt and xfce4-terminal don't work.
But xterm is too minimalist, is there an advanced terminal based on it?
And I don't unerstand why it doesn't work for xfce4-terminal but for it does for xterm...
man xfce4-terminal:
-H, --hold
Causes the terminal to be kept around after the child command has terminated
-e, --command=command
Execute command inside the terminal
man xterm:
-hold
Turn on the hold resource, i.e., xterm will not immediately destroy its window when the shell command completes. It will wait until you use the window manager to destroy/kill the window, or if you use the menu entries that send a signal, e.g., HUP or KILL.
-e program [ arguments ... ]
This option specifies the program (and its command line arguments) to be run in the xterm window. It also sets the window title and icon name to be the basename of the program being executed if neither -T nor -n are given on the command line. This must be the last option on the command line.
What the ...?
Is only my opinion that there aren't differences between:
terminal -H -e "cd $dir && $command"
and
xterm -hold -e "cd $dir && $command"
Last edited by buntolo (2012-01-06 13:11:58)

Barcode reader input and JTextField

Hi Everybody,
here is my problem: I have to read the input from a Barcode reader into a JTextField;
I have a Listener attached to the JTextField Document which works fine. The problem is that the listener is invoked as many time as the characters input (e.g 12 times, if the scanned barcode has 12 digits)
How do I know the input is complete if I don't know the length of the expected input?
Thanks in advance fon any help or ideas

What kind of Listener have you attached to the TextField?
Most bar code readers can be configured to finish the scan with a carriage return in which case if you use an ActionListener then it would solve your problem

Can't get conky-cli and bash scripts to both display in dwm statusbar!

I'm trying to configure my dwm status bar to display some simple information using conky-cli and bash scripts. At first I tried just letting conky run the bash scripts (for network and volume state), but this increased my cpu usage by about 5%, which is significant considering I normally have 1-3% usage when idle. Also, I wanted to keep conky because it makes the display of certain information easy, such as cpu & RAM usage.
The problem is I'm having trouble getting both to display side by side. Here are the relevant parts of my .xinitrc:
network(){
iwconfig wlan0 2>&1 | grep -q no\ wireless\ extensions\. && {
echo wired
exit 0
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bars=`expr $stngth / 10`
case $bars in
0) bar='[-------]' ;;
1) bar='[#------]' ;;
2) bar='[##-----]' ;;
3) bar='[###----]' ;;
4) bar='[####---]' ;;
5) bar='[#####--]' ;;
6) bar='[######-]' ;;
7) bar='[#######]' ;;
*) bar='[--!!!--]' ;;
esac
echo $essid$bar
exit 0
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exit 0
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exec dwm
(let me know if it would help to post any other files)
For some reason when I run this I only get the network/volume scripts and date running, updating every second (I think). The conky line just doesn't show up. I don't know what could be wrong, since I didn't see any error messages.
An even better solution would be to just have shell scripts to display CPU and MEM usage. I have a dual-core cpu, cpu0 and cpu1. I'd like to see both percentages if possible, or at least a percentage that is an accurate average of the two or something. In conky-cli I have something that shows:
cpu0/1: xx% xx%
Also, seeing RAM usage would help a lot. In conky it shows:
mem: xx% (xxxMB)
These are the ways I would like to have bash scripts show them, if possible, but I have zero skill in bash programming. I made this an option in case it's easier/cleaner/less resource hungry than a conky solution. Personally, if they're about the same in these aspects, I would prefer something with conky and the shell scripts because conky is so extensible, yet it's only flaw is executing scripts with minimal resource usage.
Help?

Thanks. I was thinking of using load average to save a few characters, but I didn't quite understand the numbers. I'll try that once I get to my Linux box, but could you please explain or post a link to something that explains load average (what's low, high, normal, etc.)?
EDIT: I found a website that explains loadavg. I now have my dwm status bar displaying it perfectly (yay!). Now I just need to add a few more things like battery status, etc. and I might be done. I'll probably post here if I have more questions, though.
Thanks for your help!
Last edited by Allamgir (2009-07-18 14:41:11)

How to detect line break while reading input ?

Hi all,
I am reading the user input from standard input.
I want to detect the line break. So that I can stop reading input and proceed processing the string.
Actually I am getting the SQL query as input and after that I am executing the same by passing it to a function.
Pl. do reply me.
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The above is not working properly.

But if new line comes, what will be it's value?Empty lines are discarded by the scanner.
Kaj

[SOLVED] problem with spaces and ls command in bash script

I am going mad with a bash script I am trying to finish. The ls command is driving me mad with spaces in path names. This is the portion of my script that is giving me trouble:
HOMEDIR="/home/panos/Web Site"
for file in $(find "$HOMEDIR" -type f)
do
if [ "$(dateDiff -d $(ls -lh "$file" | awk '{ print $6 }') "$(date +%F)")" -gt 30 ];
then echo -e "File $file is $(dateDiff -d $(ls -lh "$file" | awk '{ print $6 }') "$(date +%F)") old\r" >> /home/panos/scripts/temp;
fi
done
The dateDiff() function is defined earlier and the script works fine when I change the HOMEDIR variable to a path where there are no spaces in directory and file names. I have isolated the problem to the ls command, so a simpler code sample that also doesn't work correctly with path names with spaces is this:
#!/bin/bash
HOMEDIR="/home/panos/test dir"
for file in $(find "$HOMEDIR" -type f)
do
ls -lh "$file"
done
TIA
Last edited by panosk (2009-11-08 21:55:31)

oops, brain fart. *flushes with embarrassment*
-- Edit --
BTW, for this kind of thing, I usually do something like:
find "$HOMEDIR" -type f | while read file ; do something with "$file" ; done
Or put those in an array:
IFS=$'\n' ; files=($(find "$HOMEDIR" -type f)) ; unset IFS
for file in "${files[@]}" ; do something with "$file" ; done
The later method is useful when elements of "${files[@]}" will be used multiple times across the script.
Last edited by lolilolicon (2009-11-09 08:13:07)

Bash script: Rotate your wallpaper and SLiM theme at the same time

EDIT;
I've decided I should really thank Cerebral for his help with writing this script; this thank you should have been here from the get go.
After writing:
#!/usr/bin
echo "Hello World!"
I wrote a script to rotate my fluxbox background and SLiM theme at the same time, so I could have a contiuously changing background and still have a smooth transition from SLiM to fluxbox. (It just looks so much cooler when both have matching backgrounds). By the time you finish reading it, and configuring your box so it will work, you will probably have decided you could have writtin your own, better script to do the same thing. But, on the off chance anybody finds use for it, here it is:
(this should be obvious, but: don't run this script without at least reading the comments)
#!/bin/bash
#this is a script to rotate a number of backgrounds
#to be shared by the fluxbox desktop and SLiM login manager.
#it is the first meaningful script I've written. It may be
#freely distributed and used with the understanding that you are
#using it at your own risk.
#Before running this script you need to check that your SLiM
#themes are installed to the path /usr/share/slim/themes, which
#is the defulat path for installation in Arch. Here are some
#other things you need to set up:
#1. create (if you don't have it) the directory /usr/share/wallpapers
#2. create a wallpaper in /usr/share/wallpapers called 'dummy' by copying
#you current wallpaper to that filename
#3. set your window manager to display the wallpaper 'dummy', this works fine
#using a style overlay in fluxbox, I haven't tested it with any other window
#manager, but I don't see why this would cause a problem.
#4. create a directory /usr/share/slim/themes/current, you can copy one of
#your slim themes into that directory if you want. (this will prevent you
#from seeing some error messages the first time you run the script)
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#theme1 , theme2, theme3, etc. , theme305
#If you don't number consecutively, this script will not run properly. You
#must also define the total number of themes as "rotate_number"
#6. Check if the script runs, if it does, you should change /etc/slim.conf to
#use the theme "current"
#7. This theme will now rotate your SLiM theme and wallpaper in such a way as
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#"on the fly", (as of July 6, 2008), so changes will not be apparent unless you
#restart SLiM. I run the script before I run slim in my etc/rc.local local
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#Fred Drueck 2008
#Define here all themes to be rotated and the total number of
#themes to rotate:
rotate_number=9
theme1=/usr/share/slim/themes/default
theme2=/usr/share/slim/themes/lake
theme3=/usr/share/slim/themes/lunar
theme4=/usr/share/slim/themes/flower2
theme5=/usr/share/slim/themes/the-light
theme6=/usr/share/slim/themes/mindlock
theme7=/usr/share/slim/themes/parallel-dimensions
theme8=/usr/share/slim/themes/wave
theme9=/usr/share/slim/themes/fingerprint
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if [ $(id -u) != "0" ]; then
echo "You must be the superuser to run this script" >&2
exit 1
fi
echo "rotating themes"
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if [ -f /usr/share/slim/themes/current/current_theme_number ]
then
echo "checking current theme"
cd /usr/share/slim/themes/current/
eval last_theme_number=$(cat /usr/share/slim/themes/current/current_theme_number)
echo $last_theme_number
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echo "no theme is currently set, using theme 1"
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echo $1 > /usr/share/slim/themes/current/current_theme_number
fi
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eval new_theme_number=$(($(($last_theme_number % $rotate_number))+1))
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placeholder=theme
eval new_theme=\$$placeholder$new_theme_number
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rm /usr/share/slim/themes/current/background*
rm /usr/share/slim/themes/current/panel*
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cp $new_theme/background* /usr/share/slim/themes/current
cp $new_theme/panel* /usr/share/slim/themes/current
cp $new_theme/slim.theme /usr/share/slim/themes/current
#increase the theme number, but first clear the old file
rm /usr/share/slim/themes/current/current_theme_number
echo $new_theme_number > /usr/share/slim/themes/current/current_theme_number
#copy over the dummy wallpaper in "/usr/share/wallpapers" (with the theme
#background file
cp $new_theme/background* /usr/share/wallpapers/dummy
exit 0
Last edited by pseudonomous (2008-07-07 21:59:42)

oh i forgot to mention... its rotating while moving. i.e. is doesn't have to stop rotate and then continue back to origin.

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Read, Modify and Apply Report XML using Java Script

Hi Guys,
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Edited by: Kaushik K on Jun 20, 2012 8:36 PM

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Bash script read input and feh

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