Boost Your Productivity with Essential Bash Aliases and Functions

Frequent repetition of the same commands in the terminal can waste valuable time; using Bash aliases and functions lets you assign short, memorable names to commands or groups of commands, with functions handling parameters when needed.

Aliases are simple shortcuts and cannot accept arguments, whereas functions can accept any number of parameters. If an alias masks the original command, prefix the command with a backslash (e.g., \ls) to bypass the alias.

Productivity Aliases

alias ls="ls --color=auto"

– enable colored output for ls. alias ll="ls --color -al" – detailed colored directory listing. alias grep='grep --color=auto' – colored matches in grep. mcd() { mkdir -p "$1"; cd "$1"; } – create a directory and immediately enter it. cls() { cd "$1"; ls; } – change to a directory and list its contents. backup() { cp "$1"{,.bak}; } – create a .bak backup of a file. md5check() { md5sum "$1" | grep "$2"; } – compute an MD5 checksum and compare it. alias makescript="fc -rnl | head -1 >" – turn the last executed command into a script file.

alias genpasswd="strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 30 | tr -d '
'; echo"

– generate a strong random password. alias c="clear" – clear the terminal screen. alias histg="history | grep" – search command history for a keyword. alias ..='cd ..' – go up one directory level. alias ...='cd ../..' – go up two directory levels.

Archive Extraction Function

extract() {
  if [ -f $1 ]; then
    case $1 in
      *.tar.bz2)   tar xjf $1 ;;
      *.tar.gz)    tar xzf $1 ;;
      *.bz2)       bunzip2 $1 ;;
      *.rar)       unrar e $1 ;;
      *.gz)        gunzip $1 ;;
      *.tar)       tar xf $1 ;;
      *.tbz2)      tar xjf $1 ;;
      *.tgz)       tar xzf $1 ;;
      *.zip)       unzip $1 ;;
      *.Z)         uncompress $1 ;;
      *.7z)        7z x $1 ;;
      *) echo "'$1' cannot be extracted via extract()" ;;
    esac
  else
    echo "'$1' is not a valid file"
  fi
}

This function handles extraction of many common archive formats.

System Information Aliases

alias cmount="mount | column -t"

– display mounted filesystems in aligned columns.

alias tree="ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'"

– show directory structure as a tree.

sbs() { du -b --max-depth 1 | sort -nr | perl -pe 's{([0-9]+)}{sprintf "%.1f%s", $1>=2**30? ($1/2**30, "G"): $1>=2**20? ($1/2**20, "M"): $1>=2**10? ($1/2**10, "K"): ($1, "")}e'; }

– list files in the current directory sorted by size, with human‑readable units.

alias intercept="sudo strace -ff -e trace=write -e write=1,2 -p"

– attach strace to a process to monitor its writes. alias meminfo='free -m -l -t' – show detailed memory usage. alias ps?="ps aux | grep" – quickly find a process by name.

alias volume="amixer get Master | sed '1,4 d' | cut -d [ -f 2 | cut -d ] -f 1"

– display the current audio volume.

Network Aliases

alias websiteget="wget --random-wait -r -p -e robots=off -U mozilla"

– recursively download an entire website. alias listen="lsof -P -i -n" – list all network connections. alias port='netstat -tulanp' – show listening ports and associated programs.

gmail() { curl -u "$1" --silent "https://mail.google.com/mail/feed/atom" | sed -e 's/<\/fullcount.*/
/' | sed -e 's/.*fullcount>//'; }

– display the number of unread Gmail messages for a user. alias ipinfo="curl ifconfig.me && curl ifconfig.me/host" – reveal your public IP address and hostname.

getlocation() { lynx -dump http://www.ip-adress.com/ip_tracer/?QRY=$1 | grep address | egrep 'city|state|country' | awk '{print $3,$4,$5,$6,$7,$8}' | sed 's\ip address flag \\' | sed 's\My\\'; }

– obtain geolocation information for a given IP.

Fun Aliases

kernelgraph() { lsmod | perl -e 'print "digraph \"lsmod\" {"; <>; while(<>){@_=split/\s+/; print "\"$_[0]\" -> \"$_\"
" for split/,/,$_[3]} print "}"' | dot -Tpng | display -; }

– generate a visual graph of kernel module dependencies. alias busy="cat /dev/urandom | hexdump -C | grep 'ca fe'" – produce seemingly random output to appear busy.

The above aliases and functions were gathered from the author’s personal .bashrc and well‑known online resources; copying the plain‑text version into your own .bashrc instantly provides the described productivity benefits.