useful/convinient bash/zsh function snippets

e(xec).sh

# for stuff that lacks shebang, use simple file extension based file open with the right application
# somewhat similar to xdg open
function e()
{
    if [ -f $1 ]; then
        case $1 in
            *.exe)  wine $@                 ;;
            *.jpg)  gpicview $@             ;;
#           ... 
#            *.sh)   chmod +x $1 && ./$@     ;; #this is just lazy
            *)      $@                      ;;
        esac
    fi
}

extract.sh

# auto extract to current directory based on file extension 
# example usage: extract archive.tar.xz
# put this somewhere in your {ba,z}sh.rc
function extract ()
{
    GZIP="-p 8"
    if [ -f $1 ]; then
        case $1 in
            *.rpa)      unrpa $1            ;;
            *.7z)       7z x $1             ;;
            *.tar.zst)  tar -I zstd -xpvf $@;;
            *.tar.xz)   tar -xvf  $@        ;;
            *.tar.bz2)  tar -jxvf $1        ;;
            *.tar.gz)   tar -zxvf $1        ;;
            *.bz2)      bunzip2 $1          ;;
            *.gz)       gunzip $1           ;;
            *.tar)      tar -xvf $1         ;;
            *.tbz2)     tar -jxvf $1        ;;
            *.tgz)      tar -zxvf $1        ;;
            *.zip)      unzip $1            ;;
            *.rar)      unrar x $1          ;;
            *)          echo "'$1' cant recognize extension." ;;
        esac
    else
        echo "'$1' is not a valid file"
    fi
}

highlight.sh

# colorizes input
# grep --color like highlighter
# usage: cat file | hi red "rexeg1" | hi blue "regex2"

function hi()
{
        declare -A fg_color_map
        fg_color_map[black]=30
        fg_color_map[red]=31
        fg_color_map[green]=32
        fg_color_map[yellow]=33
        fg_color_map[blue]=34
        fg_color_map[magenta]=35
        fg_color_map[cyan]=36
        if [ $# -eq 1 ]; then
            fg_c=$(echo -e "\e[1;${fg_color_map[red]}m")
            c_rs=$'\e[0m'
            sed -u s"/$1/$fg_c\0$c_rs/g"
        else
            fg_c=$(echo -e "\e[1;${fg_color_map[$1]}m")
            c_rs=$'\e[0m'
            sed -u s"/$2/$fg_c\0$c_rs/g"
        fi
}

mcd.sh

# mcd: "(recursively) create directory and cd to it" shortcut
# usage: mcd test/ex1                  # mkdir test && mkdir test/ex1 && cd test/ex1

function mcd()
{
    mkdir -p "$@" && eval cd "\"\$$#\"";
}

r2profile.sh

# (radare2) automatically create a profile for opened binary
# so that analysis doesn't have to be redone again next time you open
# uses md5 of target for naming the profile and preventing name collisions
# usage: r2prof file.bin
function r2prof()
{
    BACKUP="$@"
    MD5=""
    NAME=""

    while [[ "$#" -gt 0 ]]; do
        if [ -f "$1" ]; then
            NAME=$(realpath $1)
            MD5=$(echo $NAME | md5sum | awk '{print $1}')
            echo "MD5 $MD5"
            echo "NAME $NAME"
        fi
        shift
    done
    if [[ $MD5 == "" ]]; then
        radare2 $BACKUP
    else
        echo "executing radare2 -p $MD5 $BACKUP"
        radare2 -p $MD5 ${ARG}
    fi
}

tmcd.sh

# create a temporary directory and cd to it while preserving ".."
# uses symlink that gets removed after cd e.g. realpath might not work
# use this to create temporary directory for builds (cmake ..), etc
# usage: tmcd

function tmcd
{
    TMPDIR=$(mktemp -d)
    BASE=$(basename ${TMPDIR})
    ln -s ${TMPDIR} ${BASE} || return
    cd  ./"${BASE}" || return
    rmdir ../"${BASE}"
}