I use following code convert text to image what is x, y means in text x, y ‘string’? Answer Method 1 label: You can either use label: which provides a canvas large enough to hold your text – notice I didn’t provide a canvas size: Method 2 -annotate Or, you can use -annotate to write on…
Tag: shell
Using grep and * to get the exact file name
I have following heapdump files now if I use I get following output But I use I get no output. Could anybody help where is my mistake and how to search the heapdump files. My expected output is should give me due to some reason I could not use Answer It looks like you’re confusing glob patterns with reg…
Converting watch into a unit file systemd
I’ve got a shell script as follows ss.sh The requirement is that I need to use this script with the watch command. And I’d like to make this into a systemctl service. I did it as so. sc.sh And in my /etc/systemd/system, log_info.service When I run systemctl start log_info.service, It runs but not …
Bash if condition doesn’t match when comparing particular string
Bash if condition doesn’t match when comparing particular string Matching string: Code: I expected this to match, but it does not. The same code works with other strings. Is this failing because of ( or ) character in the string? Answer You have variable matching reversed. You have to use * matching aro…
PHP Calling shell_exec on a bash script running a background process times out
I have a bash script with a few lines similar to the following Then I call that from a PHP script return shell_exec(“/path/to/bash/script arguments”); Now, when I do that, the command is run successfully, and outputfile.txt contains “Ran Command”. However, the PHP script times out afte…
grep multipe wildcards in string
Say I have a file that contains: I want to grep and match lines that only contain ‘package’, ‘el6’, and ‘x86_64’ How would I go about doing that on a one liner using grep? The line must match all three and grep shouldn’t care about how many characters are in between. …
Powershell for Linux: Workaround for missing “out-gridview”?
In Aug 2016, Microsoft’s Powershell went open-source. However, there is no “out-gridview” option yet. The autocompletion feature shows these Out* options Note that there is no Out-Gridview at this time. Did I overlook a feature, commandlet that can do something similar? Sometimes I’d i…
how to calculate percentage in shell
I would like to calculate percentage in shell. But I can’t do it. My script is It is neither showing any value nor terminating when executing this script. Answer awk will give you an n1 illegal field name if you do that, as it’s inside single quotes. Also, to avoid awk keep reading stdin you shoul…
Execute root command with no root user avoiding password prompt
I have a script.sh file executing the following command: If i try to execute with a non-root user (username = marco), the prompt password halts the script waiting for the input. I’m trying to configure the /etc/sudoers file adding the following lines, but with none of them works and I’m always pro…
Automation of networks using ansible on openstack
I’ve written an ansible script, to create a network based on a condition. So that, even if I run ansible script again it will not create duplicate entries in my openstack environment. task: I don’t have either of the twonetworks in my project. My intention was, both the statments display null outp…