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Bash Utilities
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| # | |
| # You can import this script in your current bash using the following command | |
| # source <(curl -s https://gist.githubusercontent.com/renelink/34066cb9204e5a072e7f4d284011f887/raw/bash-utils.sh) | |
| # | |
| # You can also put these lines in your .bashrc or .bash_profile to automatically install the utils if they do not exist | |
| # | |
| # ----------------------------- | |
| # BASH_UTILS_FILE="${HOME}/.bash-utils.sh" | |
| # | |
| # if ! [ -f "${BASH_UTILS_FILE}" ]; then | |
| # curl -o "$BASH_UTILS_FILE" https://gist.githubusercontent.com/renelink/34066cb9204e5a072e7f4d284011f887/raw/bash-utils.sh | |
| # fi | |
| # | |
| # . "$BASH_UTILS_FILE" | |
| # ----------------------------- | |
| # | |
| # To update the git-utils you can then just execute | |
| # $ rm ~/.bash-utils.sh | |
| # and reopen the shell | |
| # This funciton reads an environment variable's content from stdin so that it will not occur in the shell's history. | |
| # It is useful when you need to export a variable with sensitive content like a private gpg key or passphrase. | |
| # | |
| # Usage: exportSecret ENVIRONMENT_VARIABLE_NAME | |
| # | |
| # In some situations you have to press CTRL-D two times, e.g. when no new line is entered. | |
| # See https://unix.stackexchange.com/questions/701317/when-using-cat-to-create-file-i-have-to-type-ctrld-twice-to-finish-the-input | |
| # | |
| function exportSecret(){ | |
| local env_var_name="$1" | |
| if [ -z "${env_var_name}" ]; then | |
| >&2 echo "Pass the environment variable name as the first argument." | |
| return | |
| fi | |
| >&2 echo "Enter the secret value and finish with CTRL-D. Abort with CTRL-C." | |
| IFS='' read -s -r -d '' ${env_var_name} < <(cat) | |
| export ${env_var_name} | |
| } | |
| # Executes an isolated bash shell that does not load any rc or profile files and uses the PS1 provided by ISOLATED_PS1. | |
| # The isolated bash will not record a history. | |
| # | |
| # This is useful if you want to do operations with sensitive data. Just exit the shell and even sensitive data that | |
| # you put in environment variables is deleted. Such as gpg keys or passphrases. | |
| # | |
| alias bash-isolated='bash --rcfile <(echo "export PS1=\"$ISOLATED_PS1\";unset HISTFILE")' | |
| # Change this line to the default isolated bash PS1 | |
| export ISOLATED_PS1='\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[35m\]$MSYSTEM\[\e[0m\] \[\e[33m\]\w\[\e[0m\] \[\e[31m\](ISOLATED)\[\e[0m\]\n$ ' | |
| # Delte a history range. | |
| histdel(){ | |
| local start="$1" | |
| local end="$2" | |
| if [ -z "$start" ]; then echo "Usage: histdel START_INDEX [END_INDEX]"; return; fi | |
| if [ -z "$end" ]; then | |
| end=$(history 1 | awk '{print $1}') | |
| fi | |
| for h in $(seq $end -1 $start); do | |
| history -d $h | |
| done | |
| history -w # force write | |
| } |
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