echo with color in shell script

• The colour codes:

  Black        0;30     Dark Gray     1;30
  Blue         0;34     Light Blue    1;34
  Green        0;32     Light Green   1;32
  Cyan         0;36     Light Cyan    1;36
  Red          0;31     Light Red     1;31
  Purple       0;35     Light Purple  1;35
  Brown/Orange 0;33     Yellow        1;33
  Light Gray   0;37     White         1;37

• Example:

  RED='\033[0;31m'
  NO_COLOR='\033[0m'
  echo -e "${RED}Hello World${NO_COLOR}"
  

See also

• How to change the output color of echo in Linux?

grep to exclude lines with specific strings

grep with -v (invert) option will exclude the match lines in the output:

cat country.txt | grep -v "United States"

Tabs in bash script

echo with -e option will enable special characters:

echo -e "Name:\tJhon"

Python: check if file or directory exists

• os.path.exists to check if file or directory exists.

  import os
  os.path.exists('/tmp/1.txt')
  os.path.exists('/tmp')
  

• os.path.isfile to check if file exists.

  import os
  os.path.isfile('/tmp/1.txt')
  

Python: Get file absolute path

Use os.path.abspath function:

import os
os.path.abspath('abc/abc.txt')