<![CDATA[Jax's blog]]>https://jsiu22.github.io/bloghttps://jsiu22.github.io//img/intro-bg.jpgJax's bloghttps://jsiu22.github.io/blogRSS for NodeTue, 16 May 2017 20:18:44 GMT60<![CDATA[Post JSON to a RESTful service without wget, curl, netcat.]]>

If your REST URL looks like this:

 http://some.server:8080/URI/TO/RESTful/API

1. Construct your JSON variable.

#No indentations otherwise heredoc may break.
json=$(cat <<EOF
{
       "personID": $personID,
       "firstname": "$firstname",
       "lastname": "$lastname"
}
EOF
)

2. Calculate Content-Length.

 len=${#json}

3. Open TCP socket using descriptor (3).

#exec 3<>/dev/tcp/SERVER/PORT
 exec 3<>/dev/tcp/some.server/8080

4. ECHO spoofed header to descriptor (3).

#This must be on 1 line.
 echo -e "POST /URI/TO/RESTful/API HTTP/1.1\r\nHost: some.server\r\nContent-type: application/json\r\nContent-length: $len\r\nConnection: close \r\n\r\n$json">&3
# Breaking down the header
# POST /URI/TO/RESTful/API HTTP/1.1\r\n
# Host: some.server\r\n
# Content-type: application/json\r\n
# Content-length: $len\r\n
# Connection: close \r\n\r\n
# $json

5. Show response and close descriptor (3).

 cat <&3
 exec 3<&-
]]>https://jsiu22.github.io/blog/2017/05/16/Post-JSON-to-a-RES-Tul-service-without-wget-curl-netcat.htmlhttps://jsiu22.github.io/blog/2017/05/16/Post-JSON-to-a-RES-Tul-service-without-wget-curl-netcat.htmlTue, 16 May 2017 00:00:00 GMT<![CDATA[Linux kill process by user & executable]]>

Sometimes I find myself spawning a lot of identical processes by mistake.

pkill -u user -f cmd_or_process_name
]]>https://jsiu22.github.io/blog/2017/03/31/Linux-kill-process-by-user-executable.htmlhttps://jsiu22.github.io/blog/2017/03/31/Linux-kill-process-by-user-executable.htmlFri, 31 Mar 2017 00:00:00 GMT<![CDATA[What init system am I using?]]>

I had a bit of trouble finding the init system used for a Linux box I was using. Since the init process is always assigned PID 1, you can use the proc virtual file system to access the init used.

sudo /proc/1/exe --version

The output should be something like this:

exe (upstart 0.6.5)
...

or this:

systemd 231
...
]]>https://jsiu22.github.io/blog/2017/03/16/What-init-system-am-I-using.htmlhttps://jsiu22.github.io/blog/2017/03/16/What-init-system-am-I-using.htmlThu, 16 Mar 2017 00:00:00 GMT<![CDATA[Git repo permissions and hook scripts]]>

I had pretty frustrating time with my Git repo. Having setup a git group and adding the appropriate users, I found myself still having trouble when multiple people push to the repo.

Turns out Git doesn’t keep file metadata (including permissions and ownership).

How do you solve this issue? Git provides a hooks directory (.git/hooks) where you can plop down scripts that fire on repo events. Here you can change the appropriate files back to their original permissions.

]]>https://jsiu22.github.io/blog/2017/03/15/Git-repo-permissions-and-hook-scripts.htmlhttps://jsiu22.github.io/blog/2017/03/15/Git-repo-permissions-and-hook-scripts.htmlWed, 15 Mar 2017 00:00:00 GMT<![CDATA[EGit showing 'Nothing to fetch']]>

If you’re using EGit and its showing 'Nothing to fetch' but you’re sure your remote has updates. Try adding the following to your .git/config file under [remote "remote_name"].

fetch = +refs/heads/*:refs/remotes/origin/*

This makes Git fetch all refs from your remote server starting at refs/heads/ and store them under refs/remotes/origin/ locally. It does so with all branches.

]]>https://jsiu22.github.io/blog/2017/03/15/E-Gt-showing-Nothing-to-fetch.htmlhttps://jsiu22.github.io/blog/2017/03/15/E-Gt-showing-Nothing-to-fetch.htmlWed, 15 Mar 2017 00:00:00 GMT<![CDATA[Git shows everything as modified. Fix]]>

If your repository and development machines use different OS and git or your IDE shows everything as modified. You probably have a line ending issue.

Simply type the following command in your Git repository.

git config core.autocrlf false

Alternately you can edit your Git repo’s config file.

nano .git/config
...
[core]
...
autocrlf = false

The next time you pull it should work normally.

]]>https://jsiu22.github.io/blog/2017/03/14/Git-shows-everything-as-modified-Fix.htmlhttps://jsiu22.github.io/blog/2017/03/14/Git-shows-everything-as-modified-Fix.htmlTue, 14 Mar 2017 00:00:00 GMT<![CDATA[Linux Heredoc]]>

Very handy tool, personally I like to use it to quickly make scripts, or populate files.

cat << EOF > /tmp/yourfilehere
These contents will be written to the file.
        This line is indented.
EOF

You can also use the tee command to the same effect.

tee /tmp/yourfilehere << EOF
These contents will be written to the file.
        This line is indented.
EOF
]]>https://jsiu22.github.io/blog/2017/02/28/Linux-Heredoc.htmlhttps://jsiu22.github.io/blog/2017/02/28/Linux-Heredoc.htmlTue, 28 Feb 2017 00:00:00 GMT<![CDATA[Eclipse: Unable to acquire the state change lock for the module]]>

If you get the error: org.osgi.framework.BundleException: Unable to acquire the state change lock for the module: osgi.identity

That means you probably exited eclipse abruptly. To fix this, go to your workspace’s .metadata (C:\Users\USERNAME\workspace\.metadata) and delete the .lock file.

]]>https://jsiu22.github.io/blog/2017/02/28/Eclipse-Unable-to-acquire-the-state-change-lock-for-the-module.htmlhttps://jsiu22.github.io/blog/2017/02/28/Eclipse-Unable-to-acquire-the-state-change-lock-for-the-module.htmlTue, 28 Feb 2017 00:00:00 GMT<![CDATA[Hey this is my blog]]>

This is my blog for various programming findings and will act as an archive for tips and tricks I find with technology.

]]>https://jsiu22.github.io/blog/2017/02/14/Hey-this-is-my-blog.htmlhttps://jsiu22.github.io/blog/2017/02/14/Hey-this-is-my-blog.html