google.com/search?q=Bash+shell

• Arrays
  • https://www.google.com/search?q=bash+split+string+into+array
  • https://www.golinuxcloud.com/bash-split-string-into-array-linux/
• Filenames
  • dirname, basename
  • https://www.google.com/search?q=basename+without+extension
  • https://www.cyberciti.biz/faq/bash-get-basename-of-filename-or-directory-name/
    • echo “${FILE##*.}“
• Files
  • https://www.google.com/search?q=cat+file+while+read
  • https://stackoverflow.com/questions/5626374/while-read-line-do-and-grep-problems
  • http://www.compciv.org/topics/bash/loops/
  • https://www.google.com/search?q=cat+file+while+read+scope
  • https://stackoverflow.com/questions/16854280/a-variable-modified-inside-a-while-loop-is-not-remembered
• Numbers
  • https://stackoverflow.com/questions/8385627/subtract-two-variables-in-bash
    • count=$((FIRSTV-SECONDV))– fails if not pure numbers, any preceding zeros e.g. (0123)
    • count=$(expr $FIRSTV - $SECONDV) – a safer solution, though DO cost more (execution)
• Text
  • https://www.google.com/search?q=bash+string+manipulation
  • https://tldp.org/LDP/abs/html/string-manipulation.html
• Trim text
  • https://www.google.com/search?q=clean+whitespace+in+bash
  • https://stackoverflow.com/questions/369758/how-to-trim-whitespace-from-a-bash-variable

https://stackoverflow.com/questions/16842014/redirect-all-output-to-file-using-bash-on-linux

https://www.google.com/search?q=color+coded+text+output+from+command+line

https://misc.flogisoft.com/bash/tip_colors_and_formatting

https://www.google.com/search?q=cli+capture+colored+text+to+file

https://askubuntu.com/questions/502445/saving-output-of-a-grep-into-a-file-with-colors

https://www.google.com/search?q=bash+script+capture+all+outputs+to+file

https://unix.stackexchange.com/questions/424652/capture-all-the-output-of-a-script-to-a-file-from-the-script-itself

tee command – https://www.google.com/search?q=tee+command

Loops

Handle Arguments – Files w/ Possibly Spaces

Like quite common on macOS.

# ... regular options handling, getopt...
# after such loop, now the remainder of arguments, assume files/directories
COUNTER=0
while [ "$*" != "" ] ; do
  FILE_OR_PATH=$1
  shift 1
  if [ -e "$FILE_OR_PATH" ]; then
   COUNTER=$((++COUNTER))
  fi
  echo "$COUNTER $FILE_OR_PATH"
  # process_one_file "$FILE_OR_PATH"
done

PATH, including Spaces

See also .bash_profile, .bashrc, … for a bit more details on how different files are used.

$HOME/.bash_profile – File

MBP17:~ $ cat ~/.bash_profile 
if [ -f $HOME/.bashrc ]; then
        source $HOME/.bashrc
fi

$HOME/.bashrc – File

MBP17:~ $ cat ~/.bashrc 
alias la='ls -a'
alias ll='ls -l'
alias vlc='/Applications/VLC.app/Contents/MacOS/VLC'
alias cvlc='/Applications/VLC.app/Contents/MacOS/VLC -I rc'
# general path munging
PATH=${PATH}:~/bin
PATH=${PATH}:/usr/local/bin
F=~/.dropbox/comgt_init.sh
if [ -e $F ] ; then
       . $F
fi
MBP17:~ $ 

$HOME/.dropbox/comgt_init.sh – File

See also our Dropbox section.

MBP17:~ $ cat ~/.dropbox/comgt_init.sh 
# 2020-12-07
# :::bash
DROPBOX_PERSONAL=$(python -c "import json;f=open('$HOME/.dropbox/info.json', 'r').read();data=json.loads(f);print data.get('personal', {}).get('path', '')")
DROPBOX_WORK=$(python -c "import json;f=open('$HOME/.dropbox/info.json', 'r').read();data=json.loads(f);print data.get('business', {}).get('path', '')")

# DROPBOX_PERSONAL=$(echo $DROPBOX_PERSONAL|tr -d '\n')
# DROPBOX=0

if [ "$DROPBOX_PERSONAL" != "" ] ; then
       DROPBOX=$DROPBOX_PERSONAL
else
       DROPBOX="$DROPBOX_WORK"
fi

alias dbt='set | grep DROPB '

PATH="$PATH:$DROPBOX/Office/bin"
MBP17:~ $

Use

Last login: Sat Feb  6 04:49:15 on ttys093
MBP17:~ $ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Users/goham/bin:/usr/local/bin:/goham/johan/Dropbox (Holy Moly Limited)/Office/bin

MBP17:~ $ which mlabstranscode.sh 
/Users/goham/Dropbox (Holy Moly Limited)/Office/bin/mlabstranscode.sh

MBP17:~ goham$

eop