gen_ssh

#!/bin/bash

# create destination file for private ssh key
# generate ssh with credential
# print the ssh after generating
# Usage should require  directory, if no directory is entered, default directory
# will be ~/.ssh

credential=$1
filename=$2
dir=$3

# Error handling for running the script

# Check if the directory is not filled
if [ -z "$dir" ]
then
    echo "Storing in '~/.ssh' directory by default"
    dir=~/.ssh

# Check if filename is not filled
    if [ -z "$filename" ]
    then
	echo "Creating id_rsa by default"
	filename="id_rsa"

# Check if the credential field is not filled
	if [ -z "$credential" ]
	then
	    echo "Error: Usage: $0 [credential] [filename] [/path/to/dir]"
	    echo "Cleaning up ..."
	    echo "Exiting ..."
	    exit 1
	fi
    fi
fi

file_regex=$filename[0-9]*$

# create numbered file system in the directory based on the filename provided
./creat_num_files.sh $dir "$filename"
if [ $? -ne 0 ]
then
    exit $?
fi

# Find the most recent file in the directory matching the regex pattern
latest=$(ls -v "$dir"|grep $file_regex|tail -1)
if [ $? -ne 0 ]
then
    echo "Error finding most recent file"
    echo "Exiting ..."
    exit $?
fi

echo
# Generate the ssh key using the ssh-keygen command
yes|ssh-keygen -t rsa -b 4096 -C "$email" -f "$dir/$latest" -N ""
if [ $? -ne 0 ]
then
    echo "Error generating ssh key"
    echo "Exiting ..."
    exit $?
fi

# set private key permissions to owner read and write only
chmod 600 "$dir/$latest"
if [ $? -eq 0 ]
then
    echo
    echo "File permission set to 600"
fi

# populate ~/.bashrc file with script to add SSH_AUTH_SOCK env
echo "if [ -z \"\$SSH_AUTH_SOCK\" ]
then
    eval \$(ssh-agent -s)
    ssh-add "$dir/$latest"
fi" >> ~/.bashrc
if [ $? -eq 0 ]
then
    echo
    echo "Successfully set SSH_AUTH_SOCK env"
else
    echo
    echo "Error setting SSH_AUTH_SOCK env"
fi
echo
echo "Finalizing ..."

# run the script to finalize
source ~/.bashrc

echo
echo "YOUR PUBLIC SSH KEY:"
echo
cat "$dir/$latest.pub"