harishkannarao

Concat 2 video files of same video resolution and same audio codec

ffmpeg -f concat -safe 0 -i <(printf "file '%s'\n" "$HOME/Downloads/clip1.mov" "$HOME/Downloads/clip2.mov") -c copy $HOME/Downloads/output.mov

harishkannarao

Windows Powershell Commands

Check if profile exists

Test-Path $PROFILE

Create profile if it doesn't exist

harishkannarao

Quitting
:x	Exit, saving changes
:q	Exit as long as there have been no changes
:wq Write and Quit. Saves any changes made to the file
ZZ	Exit and save changes if any have been made
:q!	Exit and ignore any changes



Inserting Text

harishkannarao

Less Cheatsheet

less {filename}

Navigation
SPACE	forward one window
b	backward one window
d	forward half window

harishkannarao

#!/bin/sh

# Make the script to abort if any command fails. Use set +e to change the behaviour and ignore failed command.
set -e

# Prints the commands as it is executed. Useful for debugging. Use set +x to disable debugging.
set -x

# Set default values
ORGANISATION_NAME="${ORGANISATION_NAME:-com.example}"

harishkannarao

#!/bin/bash

# Make the script to abort if any command fails. Use set +e to change the behaviour and ignore failed command.
set -e

# Uncomment below line to print the commands as it is executed. Useful for debugging. Use set +x to disable debugging.
# set -x

# Source the functions from an url
source <(curl -s "https://gist.githubusercontent.com/harishkannarao/58d317f2743c842b5323165a492db81c/raw/75ee691d4d4568c59443a070c6e5d192d717b6bc/reusable_functions.sh")

harishkannarao

#!/bin/bash

function add()
{
  echo "$1 + $2" | bc -l
}

function subtract()
{
  echo "$1 - $2" | bc -l

harishkannarao

Bash Script loops and conditional statement example

The following blog post shows example of bash script with for loop, while loop, if elif else conditional statements.

Important aspects covered in the sample script:

• Conditional while loop
• While loop to iterate over lines in a file
• Infinite while loop with break and continue
• Infinite while loop with sleep
• Iterate over arguments passed as input using for loop
• For loop with counter

harishkannarao

#!/bin/bash

# Make the script to abort if any command fails. Use set +e to change the behaviour and ignore failed command.
set -e

# Uncomment below line to print the commands as it is executed. Useful for debugging. Use set +x to disable debugging.
# set -x

echo "Example of numerical comparison with if elif else"
for (( c=-5; c<=5; c=$c+1 ))

harishkannarao

#!/bin/bash

# Make the script to abort if any command fails. Use set +e to change the behaviour and ignore failed command.
set -e

# Uncomment below line to print the commands as it is executed. Useful for debugging. Use set +x to disable debugging.
# set -x

while [[ $# -gt 0 ]]
do