Programming :: Piping In Bash Using Python?
Dec 16, 2010
I have a bash script that I want to import in to Python, mainly just to see if I can or not. However in the script I do use some piping of commands into sed to trim it down to what I need. When I tried doing it with the os.system() call, it didn't work. The exact error is
sed: -e expression #1, char 16: unterminated `s' command
However the command that was run can be run in bash without an error. Is there a better/another way to do this? For reference the command is:
Code:
locate -n 1 wp-config.php | sed 's/wp-config.php/
/g' | sed '/wp-config.php/ d' | sed '/^$/ d'
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Jun 8, 2010
how to set the subject of this up.. but here is what I am trying to accomplish (please keep in mine, this is only my first month playing with ANY Linux programming): My shared web host limits running 2 CRONS or 2 SSH sessions at one time. I need to run more than that.. So, my solution is to run what I need on my home computer, and then push all the results via SSH to my web server.
To keep things timed, I am trying to call 4 bash scripts from inside of 1 bash script... Each bash script has variables I need to export out to the remote (web) server. Being that I can only run 2 SSH or 2 CRON sessions on the remote, it wouldn't do me any good to open up CRON or SSH remotely or locally - either way I'm maxing out. That is why I would like to call 1 final script that takes the output of the 4 bash scripts and does the job.
Main bash calls via CRON every 30 minutes:
Code: ./script_1 &
./script_2 &
./script_3 &
./script_4 &
[code]....
I need to scp the file saved by wget to the remote server. I also need to pass the SQL statement generated in each script as a command in SSH. I'm lost how to get the info from "script_x" into a string that can be used to SSH - and doing this all inside of ONE SSH command. Would I store the SQL strings in a file and call that in the SSH command line?
If so, what is the command to make sure the variable output in the "script_#" file is sent to a file? Can I call the variable from the main Bash Script? Now - the good news is, I can SSH from my local machine to the remote one.That is about as far as I got.Again - I am so new to this that my ears are still wet. This has been something I have been working on for a while, and I'm just lost at this point.
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Oct 17, 2010
Ive been learning bash over the past 6 months or so and have written a few scripts etc and i have just downloaded julius to execute my scripts and a few commands with speech recognition, the example script that comes with julius to execute commands is written in python and the example works fine when executed but i would like to further extend and customize it but i dont know anything about python, so ideally i would like to translate it to bash as that is what i am learning/using at the minute and would like to learn/use one language at a time, translating it as i think im a little out of my league, i look at the script and sort of understand how it works but i dont know anything about python and my knowledge of bash is limited for use of translating languages.
the python script is:
Code:
#! /usr/bin/python -u
# How to use it:
# julius -quiet -input mic -C julian.jconf 2>/dev/null | ./command.py
import sys
[Code].....
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Dec 17, 2010
I have searched the net for guides on GTK/Glade and have learned that I have to install Glade in order to experiment with it. It also appears that it only works for Perl. I would primarily like to use C ,Bash , Pascal or settle for Python if possible. Can anyone offer some general info on this topic?
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Jan 14, 2011
I have a text string I want to pass as the second arg to a bash shell.
My python line is :
The first arg "gap" works great and the bash shell uses it as $1
I need "fill" passed along as $2 intact
Here is the bash line:
As you can see after the -f it has to be in single quotes and $FILL will complete the single quote
Nothing is getting passed as a second arg from python, I did have the first word at one time but that was 85 tries ago and forgot how I did it!
The bash script complains about an unterminated quote.
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May 2, 2010
I wrote the Automatik widget (you can find it at :http://kde-look.org/content/show.php...&PHPSESSID=caeTo improve it, I would like to add this one-line script into a text sensor :
top -b -n 1 | head -12 | tail -6 | sed '/top/d' | awk '{ printf "%-12.12s %-4s %-4s %-3s
" , $12,$9,$10,$2}'
[code]...
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Sep 22, 2010
How one could determine (for use in a Bash or Python script) which device (eg /dev/sda1, /dev/hda1... etc) a ramfs was loaded from when booting from a USB drive.
I have a RIPLinux/Tinycore live USB disk that automatically needs to run a script that is stored on the same USB drive but not part of the RIPLinux/Tinycore image. (Please note that I do not want to put this script into the RIPLinux image.) I therefore would like to remix the RIPLinux/Tinycore ISO to automatically run this script once it has started up. After RIP linux has booted I would like to automatically mount the USB drive that RIPLinux/Tinycore was booted from. I need help detecting which device this is.
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Sep 5, 2010
i'm building a dictionary with a bash script. it works perfect except i'd prefer something faster. btw i'm just piping the output to a file.
[Code]...
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Aug 6, 2010
I have my .procmailrc file set up to pipe mail to a simple php script I've written. The only thing the script does at this point is echo back a "hello" message. However, procmail does not execute the script properly.
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Jan 10, 2010
New to ubuntu and shell scripting in general... currently I stored some data into a text file. Right now, I would like to output the data from the text file and store it into a variable. Here's what I have so far:
READ_FILE=$(cat $FILE_NAME)
This definitely works and READ_FILE has the necessary data. However, this command will trigger an output to std output and I will see data on the screen, which is not what I want. I tried:
cat $FILE_NAME | $READ_FILE
and various other variants of this. It does not output to std output but neither does anything gets stored into $READ_FILE. I tried:
cat $FILE_NAME >> $READ_FILE
and it arrived at an error of "ambiguous redirect".
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Oct 4, 2010
I am calling a bash shell script from a python script trying to pass several arguments to the bash script with no succes can this be done? I have researched (google) with no clear indication of how to achieve this. Using "os.system"
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Jun 25, 2010
Is there some type of functional way to read things in the Python shell interpreter similar to less or more in the bash (and other) command line shells?
Example:
Code:
>>> import subprocess
>>> help(subprocess)
...
[pages of stuff to read]
...
I'm hoping so as I hate scrolling and love how less works with simple keystrokes for page-up/page-down/searching etc.
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Mar 22, 2009
I want to be able to do
sudo ./program.py
instead of always having to do
sudo python program.py
What do I need to change?
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Nov 30, 2009
I've already used line split stuff to transform my data into something like this in a text file:
Code:
['1', '1', '3', '20.7505207']
['2', '1', '3', '23.0488319']
['3', '1', '3', '-1.5768747']
['4', '1', '3', '-26.4772491']
[code]....
How can I get this on a python program so I can manipulate it as an array?
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Mar 4, 2010
I have a function definition in a Python 2.x script which take a tuple as one of its arguments, but 2to3 has no answers nor any of my searching on how to represent the same in Python 3.x
Code:
def blah(self, (string1, string2))
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Feb 19, 2010
I created variables in python and would like to be able to incorporate those into bash commands that will be mixed into the script. Example:
Code:
name=raw_input("Type your name and press ENTER: ")
import os
os.system( echo "name")
Of course this doesn't actually work, but i think you get an indication of what I am trying to do.
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Nov 14, 2010
How do i do to:1. Check if there is a audio source plugged in via line in?2. Control the volumeI want to do it through either bash or python script.
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Jun 4, 2010
I do not know how to write either PYTHON or Bash Shell Scripting. I am to learn one for Linux Administration purpose. Which one will you recommend for a Linux Admin/Eng environment?
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Aug 24, 2010
I have some bash and python scripts. Is there any way to encrypt them but still be able to execute them encrypted?
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Feb 9, 2011
I want that I click with the mouse on the video, it paused.I notice that there is "BaconVideoWidget" which I guess is the video rendering widget but it don't have signal named "clicked":
Code:
vd = totem_object.get_video_widget()
vd.connect("clicked", vd.hide)
[code]....
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Aug 8, 2010
I was trying to install periscope, from the instructions here: http://code.google.com/p/periscope/wiki/NautilusSupport
The problem is that at:
cd ~/.nautilus/python-extensions
I get an error:
bash: cd: /home/mycomp/.nautilus/python-extensions: No such file or directory
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Feb 4, 2011
I would like to know how do I print the line # in a script. My requirement is, I have a script which is about ~5000 lines long. If there are any errors happen I just exit. And I would like to add the line # of the script where the error happened.
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Jan 24, 2010
simple bash code:
Code:
#!/bin/bash
trap "echo 'you got me'" SIGINT SIGTERM # to trap ctrl+c
echo "Press ctrl+c during 5 sec loop"
for ((i=0;i<5;i++)); do
[Code]...
How come code behaves normally and stops when ctrl+c signal is caught and resumes, but after I use at least one timeout read in the code it looks like, if signal is caught again it doesn't pause the execution but skips the loop. If you remove -t (timeout) option from the read, both loops look the same!
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Nov 26, 2008
I have a config file that contains:
my.config:
Code:
Now in my bash script, I want to get the output /home/user instead of $HOME once read. So far, I have managed to get the $HOME variable but I can't get it to echo the variable. All I get is the output $HOME.
Here is my parse_cmd script:
Code:
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Jul 25, 2011
I have written quite a few separate bash & scripts and php scripts that up to now I have run from cron jobs. However I have to estimate how long each takes to run, before running the next and so it probably takes much longer than necessary to run them all. They have to run in order.
Now there are so many I am thinking it would be better to have a master bash script that would run one after the other, but I am not sure how to get the master script to wait before starting to run the next script. Is this possible and is there a command that will make the script wait between bash and php scripts , for them to finish, before running the next?
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Jan 9, 2010
I would like to get the filename (without extension) and the extension separately. The best solution I found so far is:
Let FILE="thefilenameofsomefilesfor_instance.txt"
Code:
NAME=`echo "$FILE" | cut -d'.' -f1`
EXTENSION=`echo "$FILE" | cut -d'.' -f2`
I think it would be better to count the len and remove 3 chars to right to get the extension, but it can be macintosh filenames with have 4 chars for extensions.
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Apr 21, 2010
I'm starting to learn python and I am wondering whether I should start with python 2.x or should I just start learning python 3.x?
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Apr 6, 2010
I have an existing line of code from a P2 script that I cannot find a solution to converting to P3:
Code:
for i, x in map(None, list1, list2):
I have found the information about converting the simple case:
map(None,x) becomes list(x)
But my googling was unable to find a solution when more than one iterable exists.
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Jan 31, 2010
I have a python script I wrote a while ago and now I would like to call that script from inside C. I know how to do one command from C, but how would you execute an entire script from C, and passing arguments? Like:
Code:
int main(void)
{
python( myprogram(1 2 3) );
}
So I can pass arguments to my script.
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Jan 19, 2010
what the equivalent function in Python 3.1.1 is for Python 2.6.4s:
Py_FindMethod
Be buggered if I can find anything in the doco to say what replaced it or what alternative code may need to be entered to replace it
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