Edit a text file using sed

• Replace a word
• text.txt file contains following line:

  ios
  

• Run the following command to replace ios with android:

  sed -e "s/ios/android/g" -i .bak text.txt
  

• Append a word
• text.txt file contains following line:

  leopard
  

• Run the following command to append lion after leopard:

  sed -e "s/leopard/& lion/g" -i .bak text.txt
  

• Append a token to each line
• Run the following command to append 0 to each line:

  sed -e "s/$/ 0/g" -i .bak text.txt