Helpful Commands

I’m always searching for ways to do the following:

Gemini CLI - Testing

Install NPM

sudo dnf install npm

Install gemini-cli

npm install -g @google/gemini-cli

Update gemini-cli

npm install -g @google/gemini-cli@latest

List globally installed NPM packages

sudo npm -g ls

General Linux Commands

vi command to remove trailing white space in file:

:%s/\s\+$//e

vi command to remove blank lines:

:g/^$/d

sed command to remove trailing white space in file:

sed -i -e 's/\s\+$//' <file_name>

Search file for entry starting with some name and delete line. In my example I’m searching the “~/.ssh/known_hosts” file for lines that start with “host51” and deleting that line.

sed -i -e '/^host51/d' ~/.ssh/known_hosts

Append rootCA to file indenting each line with two spaces.

echo "additionalTrustBundle: |" >> install-config.yaml
sed -e 's/^/  /' /mirror/ocp4/quay-rootCA/rootCA.pem >> install-config.yaml

Force Reboot (Last Resort)

sudo systemctl reboot --force --force

Mount CIFS

sudo dnf install cifs-utils

sudo mount -t cifs -o file_mode=0777,dir_mode=0777,rw,username=administrator,password=<passwd> \
//192.168.1.190/share /mnt/win2k25

Monitor a specific process

htop -p $(pgrep -d ',' brave)

Create auth key

Note

-b bits

Specifies the number of bits in the key to create. For RSA keys, the minimum size is 1024 bits and the default is 3072 bits. Generally, 3072 bits is considered sufficient. For ECDSA keys, the -b flag determines the key length by selecting from one of three elliptic curve sizes: 256, 384 or 521 bits. Attempting to use bit lengths other than these three values for ECDSA keys will fail. ECDSA-SK, Ed25519 and Ed25519-SK keys have a fixed length and the -b flag will be ignored.

-t ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa

Specifies the type of key to create. The possible values are “ecdsa”, “ecdsa-sk”, “ed25519 (the default),” “ed25519-sk”, or “rsa”.

ssh-keygen -t rsa -b 4096

Create key/cert pair with OpenSSL

Tip

For binding more then one key for auth, create ~/.ssh/config file with following info. This will check both keys (or more) when authenticating to all hosts.

Host *
  AddKeysToAgent yes
  IdentityFile ~/.ssh/id_rsa
  IdentityFile ~/.ssh/gitea

1. Run the following command to create the private key

   openssl genrsa -out training.key 4096
   

2. Run the following command to generate CSR

   openssl req -new \
   -subj "/C=US/ST=North Carolina/L=Raleigh/O=Red Hat/CN=todo-https.apps.ocp4.example.com" \
   -key training.key -out training.csr
   

3. Run the following command to generate cert

   openssl x509 -req -in training.csr \
   -passin file:passphrase.txt \
   -CA training-CA.pem -CAkey training-CA.key -CAcreateserial \
   -out training.crt -days 1825 -sha256 -extfile training.ext
   

GIT

1. Add a new repo

   • Create a directory to contain the project.

   • Go into the new directory.

   • Type “git init”.

   • Add some files.

   • Type “git add .” to add the files.

   • Type “git commit -m “note””.

2. Sync Rep with Github

   • Go to github

   • Click new repo

   • Name repo (I use name of directory created above.)

   • Click create repo

   • Type “git remote add origin git@github.com:username/new_repo”

   • Type “git branch -M main”

   • Type “git push -u origin main”