Author:
erics, Posted on Friday, April 16th, 2021 at 3:07:24pm
The key is to define a variable first, then use the BEGIN block to initialize the variable, then reference the variable in use lib $var; later on ;-}
For example, enable a module contained in the same directory as a script called via the PATH:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 |
#!/ussr/bin/env perl use strict; use warnings; our $scriptPath; BEGIN { eval { use File::Basename; use File::Spec; $scriptPath = dirname(File::Spec->rel2abs(__FILE__)); 1; } or do { die "$0 use CRASHED: $@"; }; } use lib $scriptPath; eval { use MyModule::ABC; 1; } or do { die "$0 use CRASHED: $@"; }; |
Categories: How-To's, Technology Tags: @INC, compile, Compile-time, Dir, directory, howto, include, lib, Library, module, Path, perl, require, Run-time, runtime, tips, Use, use lib | 
No comments
Author:
erics, Posted on Monday, March 22nd, 2021 at 2:32:54pm
Ah, the power of grep!
|
|
mysql --help | grep 'Default options' -A 1 |
Categories: How-To's, Technology Tags: howto, my.cnf, mysql, tips | No comments
Author:
erics, Posted on Tuesday, March 16th, 2021 at 1:51:04pm
Recent changes to git have made the push default choice a bit confusing – “matching” vs. “simple”
I picked “matching” when prompted. This means that git push by itself will try to push ALL local branches, not just the one you are working on.
Personally, I find that a bit mad, so I decided to change it.
Push the Current Branch ONLY
To set the default to the single-branch push:
|
|
git config --global push.default simple |
Push All Branches
To set the default to the multi-branch push:
|
|
git config --global push.default matching |
https://git-scm.com/docs/git-config
Possible Values for push.default
- nothing – do not push anything (error out) unless a refspec is given. This is primarily meant for people who want to avoid mistakes by always being explicit.
- current – push the current branch to update a branch with the same name on the receiving end. Works in both central and non-central workflows.
- upstream – push the current branch back to the branch whose changes are usually integrated into the current branch (which is called @{upstream}). This mode only makes sense if you are pushing to the same repository you would normally pull from (i.e. central workflow).
- tracking – This is a deprecated synonym for upstream.
- simple – in centralized workflow, work like upstream with an added safety to refuse to push if the upstream branch’s name is different from the local one.
When pushing to a remote that is different from the remote you normally pull from, work as current. This is the safest option and is suited for beginners. This mode has become the default in Git 2.0.
- matching – push all branches having the same name on both ends. This makes the repository you are pushing to remember the set of branches that will be pushed out (e.g. if you always push maint and master there and no other branches, the repository you push to will have these two branches, and your local maint and master will be pushed there).
To use this mode effectively, you have to make sure all the branches you would push out are ready to be pushed out before running git push, as the whole point of this mode is to allow you to push all of the branches in one go. If you usually finish work on only one branch and push out the result, while other branches are unfinished, this mode is not for you. Also this mode is not suitable for pushing into a shared central repository, as other people may add new branches there, or update the tip of existing branches outside your control.
Categories: How-To's, Technology Tags: Config, Default, defaults, git, git config, git push, Matching, Push, Simple | No comments
Author:
erics, Posted on Tuesday, March 9th, 2021 at 10:36:25am
The trick to using eval to catch shell execution is to return twice, once inside the eval and once outside:
|
|
sub isMaintenance { my $return = eval { my $err=system("check_policy.sh | grep 'Policy is MAINTENANCE' >/dev/null 2>/dev/null"); &debug("perl error code: $err"); $err=$err / 256; &debug("system error code: $err"); if ($err != 0) { # Not Maintenance if ($verbose) { warn "policy is NOT MAINTENANCE\n"; } return 0; } else { return 1; } }; return $return; } |
Neat!
Categories: How-To's, Technology Tags: Code, eval, Exit, Exit Code, howto, perl, Return, System | No comments
Author:
erics, Posted on Friday, February 26th, 2021 at 11:46:15am
On MacOSX 10.10.5 Yosemite, I was having trouble with Spotlight preventing the clean eject of an attached hard drive.
Using the fuser command allowed me to see that it what the Spotlight-specific mds process preventing the eject.
|
|
fuser -u /Volumes/Archive03 |
At first, I tried to disable the indexing via the mdutil command, but that just gave me an error:
|
|
shell> sudo mdutil -Ei off /Volumes/Archive03 /Volumes/Archive03: Error: unable to perform operation. (-400) Error: unknown indexing state. |
I ended up having to force eject the drive:
|
|
shell> diskutil unmountDisk force /Volumes/Archive03 |
The actual solution was so very simple, just create an empty file at the root of each external drive you with to prevent being indexed:
|
|
touch /Volumes/Archive03/.metadata_never_index |
Categories: How-To's, Technology Tags: 10.10.5, apple, Disable, diskutil, eject, Halt, howto, Index, Indexing, Mac, MacOS, macosx, mdutil, metadata_never_index, Prevent, Spotlight, Stop, tips, Touch, umountDisk, Yosemite | No comments
Author:
erics, Posted on Friday, February 19th, 2021 at 3:18:00pm
Create two template files in the wp-content/themes/{themeName}/ subdirectory:
|
|
page_blog.php page_blog_plus_content.php |
page_blog.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
<?php /* WARNING: This file is part of the core Genesis framework. DO NOT edit this file under any circumstances. Please do all modifications in the form of a child theme. */ /** * Template Name: Blog * This file handles blog post listings within a page. * * This file is a core Genesis file and should not be edited. * * @category Genesis * @package Templates * @author StudioPress * @license http://www.opensource.org/licenses/gpl-license.php GPL v2.0 (or later) * @link http://www.studiopress.com/themes/genesis */ genesis(); |
page_blog_plus_content.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
<?php /* WARNING: This file is part of the core Genesis framework. DO NOT edit this file under any circumstances. Please do all modifications in the form of a child theme. */ /** * Template Name: Blog Plus Content * This file handles blog post listings within a page. * * This file is a core Genesis file and should not be edited. * * @category Genesis * @package Templates * @author StudioPress * @license http://www.opensource.org/licenses/gpl-license.php GPL v2.0 (or later) * @link http://www.studiopress.com/themes/genesis */ // to see the page title and page content, uncomment this: add_action('genesis_loop', 'genesis_standard_loop' ,5); genesis(); |
Categories: How-To's, Technology Tags: Blog, Blog Paage, Categories, Category, genesis, howto, page_blog, query_args, tips, WordPress | No comments
Author:
erics, Posted on Friday, February 19th, 2021 at 9:58:50am
First, use lsblk to see the raw partitions:
|
|
# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/nvme0n1p1 xfs 20G 2.8G 18G 14% / # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT nvme0n1 259:0 0 40G 0 disk ├─nvme0n1p1 259:1 0 20G 0 part / └─nvme0n1p128 259:2 0 1M 0 part |
Note how the partition at 259:1 is only 20GB, while the entire disk at 259:0 is 40GB. A partition resize is required in this case.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 |
# sudo growpart /dev/nvme0n1 1 CHANGED: partition=1 start=4096 old: size=41938911 end=41943007 new: size=83881951 end=83886047 # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT nvme0n1 259:0 0 40G 0 disk ├─nvme0n1p1 259:1 0 40G 0 part / └─nvme0n1p128 259:2 0 1M 0 part # df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/nvme0n1p1 xfs 20G 2.8G 18G 14% / # sudo xfs_growfs -d / meta-data=/dev/nvme0n1p1 isize=512 agcount=11, agsize=524159 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1 spinodes=0 data = bsize=4096 blocks=5242363, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 5242363 to 10485243 # df -hT /dev/nvme0n1p1 xfs 40G 2.8G 38G 7% / If the XFS tools are not already installed, you can install them as follows: sudo yum install xfsprogs |
For an EXT4 filesystem, use the resize2fs command instead:
|
|
sudo resize2fs /dev/nvme0n1p1 |
For more information, please visit the AMW Docs: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html
Categories: How-To's, Technology Tags: Amazon, Amazon Linux 2, AWS, df, df -hT, Disk, EBS, Expand, Filesystem, Grow, howto, Linux, Linux2, lsblk, NVMe, partition, Resize, tips, volume, XFS | No comments
Author:
erics, Posted on Monday, February 15th, 2021 at 11:43:31am
First, get the container ID using docker ps:
|
|
shell> docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3bcc0baffd68 dashboard:1.0.10-88 "docker-php-entrypoi…" 29 minutes ago Up 29 minutes 0.0.0.0:8080->80/tcp dashboard |
Now run docker exec -it {ContainerID} /bin/bash:
|
|
shell> docker exec -it 3bcc0baffd68 /bin/bash root@3bcc0baffd68:/var/www/html# exit |
You can make a simple shell script to ease typing a bit:
|
|
shell> cat dshell #!/bin/sh # dshell # usage: dshell ContainerID docker exec -it $* /bin/bash |
Categories: How-To's, Technology Tags: Container, Docker, docker exec, docker ps, Exec, howto, login, ps, Shell, tips | No comments
Author:
erics, Posted on Thursday, February 11th, 2021 at 8:36:14am
## to add a single backslash in front of whatever char was matched
|
|
my $password = q#abc'A1r%Fgt&jh[-#; $password =~ s/(['])/\\$1/g; print qq#'$password'\n#; 'abc\'A1r%Fgt&jh[-' |
## to double whatever char was matched
|
|
my $password = q#abc'A1r%Fgt&jh[-#; $password =~ s/(['])/$1$1/g; print qq#'$password'\n#; 'abc''A1r%Fgt&jh[-' |
## to convert ‘ to ‘\” for shell execution
|
|
my $password = q#abc'A1r%Fgt&jh[-#; $passwordShell =~ s/(['])/$1\\$1$1/g; print qq#'$password'\n#; 'abc'\''A1r%Fgt&jh[-' |
Categories: How-To's, Technology Tags: Backslash, Characters, double, double quotes, Escape, howto, perl, quote, quotes, Replace, Single, single quotes, Speci, Special, Special character, Substitute, tips | No comments
Author:
erics, Posted on Monday, February 8th, 2021 at 12:36:33pm
Test Renewal of a Single Domain
|
|
certbot renew --cert-name yourdomain.com --dry-run |
Execute Renewal of a Single Domain
|
|
certbot renew --cert-name yourdomain.com |
Categories: How-To's, Technology Tags: cert-name, Certbot, certbot renew, dry-run, howto, LetsEncrypt, Renew, Renewal, tips | No comments
