Hi @shiva12
Looking at your screenshots it seems your usage of the sed command is incorrect.
The sed commands require a pattern and the replacement to the file on which the substitution needs to be performed, something like sed 's/pattern/replacement/' filename.txt
But your command provides only one argument.
To get the Docker build with the Dockerfile working try:
sed -i 's/Listen 80/Listen 8089/g /etc/apache2/ports.conf`
Hope this helps!
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thank u very much santosh sir