Good-tips.md

Installation process history inquiry

dnf history

Rollback action (removing history)

dnf history rollback {history id of wanting to go back}

Undo action (registering history)

dnf history undo {history id of wanting to undo}

Undo last action (without id)

dnf history undo last

Extract file list only & Extract file name only

ls -l | grep -v ^d > {file name for saving list}
cut -c 46- {file name for saving list}

Backup dnf history

mv /var/lib/dnf/history.sqlite history.sqlite_backup

Clear dnf history

rm -rf /var/lib/dnf/history.sqlite

show info of module

dnf module info {mod_name}

show module list

dnf module list

enable module

dnf module enable {mod_name}

download iso file from web (reduce integrity problem)

wget {URL}

provide list of updateable pacakges

dnf check-update
ex)

enabled or disabled repositories and add new repositories

dnf config-manager --enable {repo_name}
dnf config-manager --disable {repo_name}
dnf config-manager --add-repo {baseURL_of_repo}

Print the number of included strings (in vi editor)

:%s/module//n

Delete line containing string (in vi editor)

:%g/module/d

Substitute string (in vi editor)

:%s/(finding_pattern)/(changing_pattern)/(option) ex) :%s/"//g

Substitute string by line (in vi editor)

:(start_line),(end_line)s/(finding_pattern)/(changing_pattern)/(option)

trouble shooting: remote: HTTP Basic: Access denied

git config --system --unset credential.helper git config credential.helper store git pull