In Perl, how to get the epoch timestamp, the number of seconds passed since the epoch?
In Perl, to get the epoch time, call the time function:
my $ts = time
Example:
$ perl -e 'print time . "n"'
1491473202
DNF/YUM can automatically download the RPM packages and install them. Under some situations, we may prefer to make a copy of the RPM files for offline usage so that no need to have network connections to install the software packages. For such purposes, we need to make a copy of the RPM packages. It is…
`git log` only list all the commits in the current working branch. For some cases, we may want to list all the commits in a git repository. The `git log` command does not do this. But there are other supports in `git` that can do so. The command to list all commits is git rev-list…
The way for Ubuntu 17 to installing the gnome-shell-extensions package does not work any more for Ubuntu 18.04. How to enable user themes in Ubuntu 18.04? The updated gnome-shell-extensions package actually adds the User Theme extension back. You can use that. First, install the package sudo apt install gnome-shell-extensions Second, log out and login again…
I have many files in a directory on Linux. How to find top K largest files in a directory? For example, find top 10 (K=10) large files in the current directory: du -h –max-depth 1 * | sort -rh | head -n 10 Read more: How to sort all files recursively by modification time in…
Some JavaScript libraries send data by POST instead of JSON. In node.js, how to parse the POST data? You can use the “querystring” module: var qs = require(‘querystring’) The following piece of code works well for me. The comments should help you read the code well. var post_handle = function(request, response) { if (request.method ==…
Vim can detects the file types from quite well. But under certain situations, such as creating a new file, Vim does not automatically set the file type. How to manually set it? In side Vim, to set a filetype, set value to the filetype variable. For example, to set the filetype to php: :set filetype=php…