History functions

(in /home/bsgt/stablecaps_bashrc/modules/history_module.sh)

Function Index

01 - hist_nlines
02 - grep_history
03 - _chop_first_column
04 - _add_line_numbers
05 - _top_ten
06 - _unique_history
07 - ghf
08 - histdel
09 - histdeln

---

>> hist_nlines():

about: Get last N entries from bash history. N default is 100 lines

group: history

param: 1: An integer corresponding to the number of history lines to tail

example: $ hist_nlines 200

function hist_nlines() {

    if [ $# -eq 0 ]; then num_lines=100; else num_lines=$1; fi

    history | tail -n $num_lines;
}

---

>> grep_history():

about: Grep bash history

group: history

example: $ grep_history ls

function grep_history() {

    history | grep "$1" ;
}

---

>> _chop_first_column():

function _chop_first_column() { awk '{for (i=2; i<NF; i++) printf $i " "; print $NF}' ; }

---

>> _add_line_numbers():

function _add_line_numbers() { awk '{print NR " " $0}' ; }

---

>> _top_ten():

function _top_ten() { sort | uniq -c | sort -r | head -n 10 ; }

---

>> _unique_history():

function _unique_history() { _chop_first_column | _top_ten | _chop_first_column | _add_line_numbers ; }

Function Calls:

└─ _unique_history
   ├─ _chop_first_column
   ├─ _add_line_numbers
   └─ _top_ten

---

>> ghf():

about: Grep bash history Function

group: history

param: 1: With no args supplied, ghf returns the top 10 most used commands

param: 2: With 1 search strings ghf returns top 10 uses for that term

param: 3: With 2 search strings ghf executes a further search filter to the top10

example: $ grep_history mkdir

function ghf() {

    if [ $# -eq 0 ]; then hist_nlines | _unique_history; fi
    if [ $# -eq 1 ]; then grep_history "$1" | _unique_history; fi
    if [ $# -eq 2 ]; then
        $(grep_history "$1" | _unique_history | grep ^$2 | _chop_first_column)
    fi
}

Function Calls:

└─ ghf
   ├─ hist_nlines
   ├─ grep_history
   └─ _unique_history
      ├─ _chop_first_column
      ├─ _add_line_numbers
      └─ _top_ten

---

>> histdel():

about: Delete lines of history between N -> N+n. Excluding histdel iteself.

group: history

param: 1: starting line to delete

param: 2: ending line to delete

example: $ histdel 1000 1033

function histdel() {

    for h in $(seq $1 $2 | tac); do
        history -d $h
    done
    history -d $(history 1 | awk '{print $1}')
}

---

>> histdeln():

about: Delete last N lines of history including histdeln

group: history

param: 1: Number of lines to delete

example: $ histdeln 10

function histdeln() {

    n=$(history 1 | awk '{print $1}')

    histdel $(( $n - $1 )) $(( $n - 1 ))
}

Function Calls:

└─ histdeln
   └─ histdel

Aliases

Alias Name	Code	Notes
hist	history'	shows all history
gh	history | grep '	grep all history