SED command to replace strings with in file -

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i trying use sed replace strings special characters in text file. sed command becoming complicated. if please me exact command. 

code -  sed -i 's;ps1='${hostname} [$oracle_sid] $pwd> ';ps1="${col_yellow}'customer test:${hostname}:[$oracle_sid]:$pwd> '${col_end}";g'

i tried escape special characters below not working. 

sed -i 's;ps1=\'\${hostname} [\$oracle_sid] \$pwd> \';ps1="\${col_yellow}\'customer test:\${hostname}:[\$oracle_sid]:\$pwd> \'\${col_end}";g' .bash_profile_backup

this might work (gnu sed):

sed -i 's|ps1='\''${hostname} \[$oracle_sid\] $pwd> '\''|ps1="${col_yellow}'\''customer test:${hostname}:[$oracle_sid]:$pwd> '\''${col_end}"|g' file

n.b. ' need quoted in both pattern , replacement whereas [] needs escaped in pattern only.


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