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How can I list all the ppa repositories added to my system and save it to a .txt file, so that I don't want to spend my time in searching for ppa's for fresh installations and i can just select a ppa line in my .txt file and append to the command sudo add-apt-repository? Also is there any other ways to do this in which i dont want to give the gpg keys manually?

From How can I get a list of all repositories and PPAs from the command line into an install script?

Part of the answer looks to have what you are looking for:

#! /bin/sh 

# listppa Script to get all the PPA installed on a system ready to share for reininstall

for APT in `find /etc/apt/ -name *.list`; do

    grep -o "^deb http://ppa.launchpad.net/[a-z0-9-]+/[a-z0-9-]+" $APT | while read ENTRY ; do

        USER=`echo $ENTRY | cut -d/ -f4`

        PPA=`echo $ENTRY | cut -d/ -f5`

        echo sudo apt-add-repository ppa:$USER/$PPA

    done

done

Save this as listppa.sh

listppa.sh > installppa.sh

This creates a script that you can backup somewhere, then run to add your PPAs on a fresh install by simply running:

installppa.sh

For those who just want to check the PPAs they have installed without actually doing anything with them automatically you can do:

$ apt-cache policy

In my system, here's a bit of what it shows:

% apt-cache policy

Package files:

 100 /var/lib/dpkg/status

     release a=now

 500 http: ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/ precise/main Translation-en

 500 http: ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/ precise/main i386 Packages

     release v=12.04,o=LP-PPA-ubuntu-toolchain-r-test,a=precise,n=precise,l=Toolchain test builds,c=main

     origin ppa.launchpad.net

 500 http: ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/ precise/main amd64 Packages

     release v=12.04,o=LP-PPA-ubuntu-toolchain-r-test,a=precise,n=precise,l=Toolchain test builds,c=main

     origin ppa.launchpad.net

 500 http: ppa.launchpad.net/rael-gc/scudcloud/ubuntu/ precise/main Translation-en

 500 http: ppa.launchpad.net/rael-gc/scudcloud/ubuntu/ precise/main i386 Packages

     release v=12.04,o=LP-PPA-rael-gc-scudcloud,a=precise,n=precise,l=ScudCloud - Linux client for Slack,c=main

     origin ppa.launchpad.net

...

Quoted from here:

[apt-cache policy] retrieves priorities associated with each repository resource. From
its output, you can infer a list of all available repositories and
PPAs.

Source: http://ask.xmodulo.com/list-installed-repositories-ppas-ubuntu.html

From my answer on How can I get a list of all repositories and PPAs from the command line into an install script?

List PPAs in ppa:USER/REPO format:

grep -E '^debs' /etc/apt/sources.list /etc/apt/sources.list.d/*.list |

  cut -f2- -d: |

  cut -f2 -d' ' |

  sed -re 's#http://ppa.launchpad.net/([^/]+)/([^/]+)(.*?)$#ppa:1/2#g' |

  grep '^ppa:'

List all repositories including PPAs in ppa:USER/REPO format:

Just remove the last grep (don't forget to remove the | from the previous line after thesed command).

See my answer on the other question for full scripts you can save and use, including generating an install script.