Tagged Questions
2
votes
1answer
65 views
Bash script and processes
I have created a bash script for use with a graphical bar in Linux, however the script seems to spawn too many processes.
The script:
#!/usr/bin/bash
executable="/usr/local/bin/bar"
monitor=${1:-0}
...
2
votes
1answer
499 views
Gnome + Linux: GUI apps don't inherit PATH from parent console apps
In Gnome, don't GUI applications inherit the PATH of the shell process that launches them? Apparently, GUI applications see only the PATH specified in ~/.profile. No issues with console applications, ...
3
votes
4answers
137 views
How to cut everthing until a specific word / after a find in a script
Hello I try to get the output of files from today wich contains ERROR.
I use this to find the files I want:
find /home/user/logfilesError/ -maxdepth 1 -type f -name "gandalf_*"\
-daystart -mtime ...
2
votes
3answers
226 views
How to launch two threads in bash shell script?
I am trying to copy files from machineB and machineC into machineA as I am running my below shell script on machineA.
If the files is not there in machineB then it should be there in machineC for ...
8
votes
7answers
19k views
Which shell should I use - tcsh vs bash?
I have been using tcsh for a long time now. But whenever I am searching for something, I often find that the methods specified are bash specific. Even the syntax for the shell scripts is different for ...
56
votes
12answers
73k views
How can I resolve a hostname to an IP address in a Bash script?
What's the most concise way to resolve a hostname to an IP address in a Bash script? I'm using Arch Linux.
1
vote
1answer
467 views
Can I use pmap to find out Memory utilization?
I want to measure memory utilization of my Apache Server. Can I use the pmap command and pass all the process IDs of httpd and take that as total utilization?
pmap PID1 PID2 ....
It seems that pmap ...
0
votes
1answer
3k views
rsh shows “poll: protocol failure in circuit setup”, why?
In the starting rsh worked properly, but after making some changes it shows some error [changes are shown in the end of this question, see that], I am sharing the same.
Command
$ /usr/bin/rsh ...
8
votes
3answers
2k views
Why do I need a tty to run sudo if I can sudo without a password?
I have configured sudo to run without a password, but when I try to ssh 'sudo Foo", I still get sudo: sorry, you must have a tty to run sudo.
Why does this happen and how can I work around it?
1
vote
1answer
31 views
Bash loop new user
I have to create 20 users on 10 servers. I want to create a script that will create 20 users for me on the server (that's easy with useradd) and encrypt the password. I have my variable
$crypt=perl ...
5
votes
3answers
663 views
Prompt user to login as root when running a shell script
The problem I am getting is, when I enter the command,
su - root
at the beginning of my shell script file, it prompts the user to enter the password and then does NOT continue with the rest of the ...
5
votes
2answers
238 views
How to find out if httpd is running or not via command line?
I'm working on a small control panel for my server. I need a command that will say if httpd is running or stopped.
Will probably be using the same code for other services as well.
0
votes
1answer
49 views
Is there a way of copying only directories and not files in bash? [closed]
I want to copy only directories from a folder on a remote server to my server. Is that possible?
Here is the code I have so far but it copies files and folders:
scp -rq ...
1
vote
1answer
27 views
copy mp3 to a target directory maintaining directory structure and deleting files when copy complete
Found this answer here for copying files and keeping directory structure.
copy files
find . -name '*.xxx' -exec cp -iv --parents -t /path/to/target_dir {} +
Is there an easy way to maintain the ...
0
votes
2answers
31 views
Configuration file for Virtual Console
Does any configuration file exist for virtual console, when a user logins in it which is read and executed ?
My requirement: To execute some shell commands when a user logins using the virtual ...
3
votes
3answers
3k views
Fix “firefox is already running” issue in Linux
I am trying to open Firefox in CentOS, but I'm getting the following message:
Firefox is already running but is not responding
and Firefox doesn't open. I tried this in command line:
kill ...
1
vote
2answers
83 views
Changing user to root when connected to a linux server and copying files
My script is coded in a way that doesn't allow you to connect to a server directly by root. This code basically copies files a server to my computer and it works but I don't have access to many files ...
1
vote
4answers
105 views
How to set the process won't be terminated when the terminal stops
[Edit]
Make it simple.
I invoked java xxx... on Machine A using putty to connect from Machine B. However I cannot reach Machine B. How can I connect Machine A from Machine C to set the running ...
4
votes
4answers
778 views
What is the most efficient way to move a large number of files that reside in a single directory?
CentOS 5.x
I apologize if this is a repeat question. I've seen a lot of similar questions (regarding deleting files) but not exactly the same scenario.
I have a directory containing hundreds of ...
0
votes
2answers
35 views
What are the specific naming conventions for variables in bash shell scripting language? [duplicate]
Is it the same convention as those used in known programming languages such as Java and C? I'm trying to create a lot of variables and I want it to start with a number, but I'm not sure if it's okay.
3
votes
5answers
140 views
Listing directories based on size from largest to smallest on single line
I can use the following command to get a list of directories and their sizes and sort them from largest to smallest (in the example I renamed the directories to numbers to make this easier to ...
3
votes
2answers
610 views
Trying to run oprofile on ubuntu kernel but cannot find vmlinux file
I am trying to run oprofile on my ubuntu host but cannot find the vmlinux file. The set up sfor oprofile needs this file:
As given here : ...
1
vote
0answers
183 views
How to use rsync with GNU parallel?
I am using scp to copy the files in parallel using GNU parallel with my below shell script and it is working fine.
I am not sure how can I use rsync in place of scp in my below shell script. I am ...
4
votes
2answers
12k views
How to display open file descriptors but not using lsof command
Hi I have read Here that lsof is not an accurate way of getting the number of File Descriptors that are currently open. He recommended to use this command instead
cat /proc/sys/fs/file-nr
While ...
2
votes
1answer
41 views
Trying to compare a variable that is multiline in a if comparison
Here is the current file I am running:
#!/bin/ksh -x
export BIN_DIR="../../env"
. $BIN_DIR/vdenv.ksh
success="DROP
CREATE TABLE
GRANT"
$worker_dir/runsql.ksh ddl X X > chnl_avt_v1.log
...
1
vote
1answer
69 views
How to copy in two folders simultaneously using GNU parallel by spawning multiple threads?
I am trying to copy files from machineB and machineC into machineA as I am running my below shell script on machineA.
If the files is not there in machineB then it should be there in machineC for ...
0
votes
3answers
97 views
Applying different permissions to files vs. directories
Sunny answered the question above in this post, The answer was given as
No need for scripts.
// Directories:
find . -type d -exec chmod XXX {} \;
// Files:
find . -type f -exec chmod ...
0
votes
2answers
91 views
Bad configuration option: ControlPersist while scp with control master?
I am using SCP with ControlMaster to copy the files but somehow I am getting this error back -
command-line: line 0: Bad configuration option: ControlPersist
command-line: line 0: Bad configuration ...
3
votes
2answers
92 views
Identify partition by mount point
How can we identify what partition a filesystem is mounted on in Linux when the partition is not directly referenced in df output?
For example, our system's fdisk output is:
Device Boot ...
1
vote
2answers
100 views
How to properly launch a program and make possible to redirect its running output (stdout and stderr) at a later stage?
The problem is quite simple: I find useful to have the possibility to switch on (and off) the output of some running program in each moment I need. To be more precise I want to be free to redirect ...
5
votes
3answers
305 views
How can I background a shell script during a Kickstart?
I have a Red Hat Kickstart process which reports its progress at key points via a POST request to a status server.
This is fine during %pre and %post, but when the actual build is taking place ...
37
votes
12answers
26k views
How can I get my external IP address in bash?
I need to find my external IP address from a bash script. At the moment I use this function:
myip () {
lwp-request -o text checkip.dyndns.org | awk '{ print $NF }'
}
But it depends on ...
8
votes
4answers
11k views
Is there a way to set the size of the history list in bash to more than 5000 lines?
No matter how much I set the HISTSIZE environment variable to be larger than 5000, when printing the history list with the history builtin, it prints only the last 5000 commands.
I need that because I ...
2
votes
3answers
84 views
How to split the array in set of five files and download them in parallel?
I am trying to copy files from testMachineB and testMachineC into testMachineA as I am running my shell script on testMachineA.
If the file is not there in testMachineB, then it should be there in ...
2
votes
1answer
106 views
No password prompt when using rsync remotely?
I have a bash script that executes rsync transfers to a remote location, and every time I execute the script I get asked for a password.
Is there a way to avoid this?
This is the command I use: ...
3
votes
1answer
306 views
Why does the filename contains question marks when I run a script on my remote machine?
I have a tiny script that simply fetches the current date, runs a PHP script and redirect the output (and errors) to a filename containing the current date.
DATE=$(date +"%Y%m%d")
...
0
votes
1answer
70 views
wget failing when I enter variable name in command
I have a small bash script to download a file from my webserver. I pass the $File variable through the command line and then insert it into the wget command as follows:
File=${1}
wget -a ...
3
votes
2answers
1k views
realpath command not found
I have debian squeeze amd64. My current shell is bash. If I write the following in my terminal, it works:
$ uname -a
Linux core 2.6.32-5-amd64 #1 SMP Fri May 10 08:43:19 UTC 2013 x86_64 GNU/Linux
$ ...
1
vote
1answer
101 views
How to implement retry mechanism while executing the server url in the shell script?
I am working on a project in which I need to make a url call to one of my server from the bash shell script..
http://hostname.domain.com:8080/beat
After hitting the above url, I will be getting the ...
0
votes
1answer
44 views
where does history timestamp stored before i enable it
I tried to set timestamp for history.
My first attempt was do export EXTENDED_HISTORY=ON command, and it seems like doesn't work.
Then i do echo 'export HISTTIMEFORMAT="%d.%m.%y %T "' >> ...
1
vote
0answers
44 views
Disable commands for users [duplicate]
I have users that login automatically via ssh to a script I defined instead of a shell. The script basically launches a program which has a shell-escape in it which would allow the user to execute ...
2
votes
3answers
12k views
linux + add X days to date and get new virtual date
I have Linux ( RH 5.3) machine
I need to add/calculate 10 days plus date so then I will get new date (expiration date))
for example
# date
Sun Sep 11 07:59:16 IST 2012
So I need to get
...
0
votes
2answers
59 views
Different forms of executing a shell script
There are a few similar questions around that I've already seen, but I've come up with something different.
I'm reading this http://www.tldp.org/LDP/abs/html/invoking.html and I got confused when I ...
1
vote
2answers
127 views
How to copy three files at once instead of one file at a time in bash shell scripting?
I am running my shell script on machineA which copies the files from machineB and machineC to machineA.
If the file is not there in machineB, then it should be there in machineC for sure. So I will ...
0
votes
1answer
57 views
Bash code runs correctly when it is executed in terminal but does not work properly when executed using udev
I am trying to move various files present in a pendrive into their respective folders on PC. ie ,Music files into music folder,text files into Documents and so on..
I have written a script for that ...
0
votes
0answers
22 views
udev set kdbrate settings on linux with console users issue
I have a kbdrate setting as a udev rule for usb devices(keyboards and scanners that re repluggd in). kdbrate needs to be set by someone with /dev/port access which is the console user. The udev rule ...
0
votes
0answers
20 views
Convert rgba color value to a Terminal supported color
Randomly I will take the following example:
rgba(122, 143, 186, 0.54)
How can I convert this color to the closest Terminal supported color?
1
vote
1answer
73 views
How to check for a folder inside a particular folder in shell script?
I am working on a shell script and python script as well. Python script is passing certain parameters to my shell script and then I am using those parameters in my shell script.
Below is my shell ...
0
votes
2answers
193 views
What are ways to encrypt a password inside an environment variable
I have this file I use to set my username and password before exporting the value.
#!/bin/bash
echo -n "User:";
read user
echo -n "Password:";
read -s password
export ...
4
votes
2answers
110 views
How to kill a process started as daemon?
I start a process using foo &.
It outputs something like:
[1] 16915
This is the process id, I guess.
How can I store this number into a variable named MY_PROCESS_ID (for example)?
Then I ...
