Today I Learnt, sed
hold/pattern space use.

Sgoti talks
about using sed hold/pattern spaces.

• Tags: TIL, sed

I
fixed the ${ls} /usr/bin to ${ls} ${bindir}
issue mentioned in the show.

#!/bin/bash

# License: GPL v3

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.



#Name: grab-bin.sh

#Purpose: Link your binaries.

#Version: beta 0.07

#Author: SGOTI (Some Guy On The Internet)

#Date: 2023-12-17



#variables:



bindir=/usr/bin/



awk=${bindir}awk

cat=${bindir}cat

chmod=${bindir}chmod

date=${bindir}date

echo=${bindir}echo

find=${bindir}find

ls=${bindir}ls

mktemp=${bindir}mktemp

sed=${bindir}sed

uniq=${bindir}uniq



#start:



    ${echo} -e "\nStep 0: $(${date} +%F), $(${date} +%T)";



# Create the /tmp/ directory to place the files.

function mkt (){

if [ -d /tmp/$(${date} +%F).* ]; then

    tmpdir1=$(ls -d /tmp/$(${date} +%F).*)

        ${echo} -e "The directory already exists.\n${tmpdir1}"

else

    tmpdir0=$(${mktemp} -d /tmp/$(${date} +%F).XXXXXXXX)

    tmpdir1=${tmpdir0}

    ${find} "${tmpdir1}" -type d -exec ${chmod} -R =700 {} +;

        ${echo} "Had to create ${tmpdir1}"

fi

}



mkt

    ${echo} -e "\nStep 1: $(${date} +%F), $(${date} +%T)";



# Files created by this script.

tmpdoc0=${tmpdir1}/$(${date} +%Y%m%d)variables.txt

tmpdoc1=${tmpdir1}/$(${date} +%Y%m%d)bash.vim

tmpdoc2=${tmpdir1}/$(${date} +%Y%m%d)sed-script.sed



# Here-document to build the first document (variables.txt).

${cat} > ${tmpdoc0} << "EOL0"

bindir=/usr/bin/



EOL0



# variables.txt body.

${ls} -1 ${bindir}

| ${sed} -n '

h

s/[^0-9a-zA-Z]//g

G

s/\n/ /

s/(.*) (.*)/1=${bindir}2/p

' >> ${tmpdoc0}

${sed} -i '/[/d' ${tmpdoc0}



    ${echo} -e "\nStep 2: $(${date} +%F), $(${date} +%T)";



# Bash.vim here-document.

${cat} > ${tmpdoc1} << "EOL1"

iabbr case;

case ${var_name} in

<CR>    [yY])

<CR>    ${echo} 'User said, "Yes"';

<CR>    ;;

<CR>

<CR>    [nN])

<CR>    ${echo} 'User said, "No"';

<CR>    ;;

<CR>

<CR>    [qQ])

<CR>    ${echo} "Let's get outta here.";

<CR>    exit

<CR>    ;;

<CR>

<CR>    *)

<CR>    ${echo} "Good Heavens! Someone broke the script I'm writing.";

<CR>    exit

<CR>    ;;

<CR>esac



iabbr here; ${cat} << _EOD_<CR>_EOD_<CR><ESC>2k0



iabbr func function NAME () {<CR><CR>}<UP>

iabbr if; if []; then<CR><ESC>Ielse<CR>${echo} "Good Heavens!"<CR><ESC>Ifi<ESC>4k0A

iabbr ali; alias NAME=''<ESC>B



iabbr ; ()<Left><Left>



EOL1



# bash.vim body.

${ls} -1 ${bindir}

| ${sed} -n ' {

h

s/[^0-9a-zA-Z]//g

G

s/\n/ /

s/(.*) (.*)/iabbr 1 ${2}/p

}

' >> ${tmpdoc1}



# Bash.vim here-document second pass.

${cat} >> ${tmpdoc1} << EOL1-5



iabbr vars;

bindir=/usr/bin/

<CR>

EOL1-5



# bash.vim body second pass.

${ls} -1 ${bindir}

| ${sed} -n ' {

h

s/[^0-9a-zA-Z]//g

G

s/\n/ /

s/(.*) (.*)/\<CR>1=${bindir}2/p

}

' >> ${tmpdoc1}



${sed} -i '/{[}/d; /${bindir}[/d' ${tmpdoc1}



    ${echo} -e "\nStep 3: $(${date} +%F), $(${date} +%T)";



# Sed script here-document.

${cat} > ${tmpdoc2} << "EOL2"

#!/usr/bin/sed -f



EOL2



# Sed script body.

${ls} -1 ${bindir}

| ${sed} -n '

h

s/[^0-9a-zA-Z]//g

G

s/\n/ /

s/(.*) (.*)/s/\<2\>/${1}/g/p

' >> ${tmpdoc2}

${sed} -i '/[/d' ${tmpdoc2}



${find} "${tmpdir1}" -type d -exec chmod -R =700 {} +;

${find} "${tmpdir1}" -type f -exec chmod -R =600 {} +;



    ${echo} -e "\nStep 4: $(${date} +%F), $(${date} +%T)";



exit;

• Source: In-Depth Series:
  Learning sed


• Source: In-Depth Series:
  Today I Learnt

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