Add existing scripts

common.v3.sh

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+#!/usr/bin/env bash
+# Inform the user of the output they can expect.
+
+echo "common commands:"
+
+
+# The following variables control how the command runs.
+shell_binary=""     # A place to store the shell binary value
+history_file=""     # A place to store the history file path
+history_lines=1000  # The number of lines of history to search through
+command_count=10    # The number of common commands to show
+
+# Check whether you can determine the name of the shell binary
+shell_regex="([^/]+$)"
+if [[ $SHELL =~ $shell_regex ]]; then
+    # Depending on the name of the shell binary, set the history filepath
+    shell_binary=${BASH_REMATCH[1]}
+    if [[ $shell_binary == "bash" ]]; then
+        history_file=~/.bash_history
+    elif [[ $shell_binary == "zsh" ]]; then
+        history_file=~/.zsh_history
+    fi
+fi
+
+# If you are searching through the bash history, you can look at the history file
+# to get the most common commands
+if [[ $shell_binary == "bash" ]]; then
+    
+    # Show the most commonly used commands
+    tail "${history_file}" -n ${history_lines} \
+        | sort \
+        | uniq -c \
+        | sed 's/^ *//' \
+        | sort -n -r \
+        | head -n ${command_count}
+
+elif [[ $shell_binary == "zsh" ]]; then
+
+    # Z shell shitory lines look like this:
+    # : 1621135004:0;uname -a
+    # Run the same command as above, and extract everything _after_ the
+    # semicolon, which is the command text
+    tail "${history_file}" -n ${history_lines} \
+        | cut -d';' -f2 \
+        | sort \
+        | uniq -c \
+        | sed 's/^ *//' \
+        | sort -n -r \
+        | head -n ${command_count}
+else
+
+    # show a warning to the user that you don't know where the history file
+    # is for their shell
+    echo "Sorry, I don't know where to find the history file for '${SHELL}'"
+fi