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I'm using ubuntu OS and I took backup using

sudo -u postgres pg_dump dbname | gzip > filename.gz

in the file path as...

/home/administrator/Documents/DB_Backup# sudo -u postgres pg_dump dbname | gzip > filename.gz

Later, I tried to restore it back using these following below...

 1. gunzip -c filename.gz | psql glialmine
 2. cat filename.gz | gunzip | psql
 3. sudo -u postgres  psql pg_restore -d dbname  filename.gz

all these 3 restore option I used asks password, but I have only one login and I tried it and its not accepting it I also tried root password and linux login password too but its not working.

For first two it asks password like below

Password:
psql: fe_sendauth: no password supplied

and for 3rd one it asks password and its error for my password like below

 Password for user pg_restore: 
 psql: FATAL:  password authentication failed for user "pg_restore"
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closed as off-topic by dezso, Mark Sinkinson, Max Vernon, RolandoMySQLDBA, Colin 't Hart May 8 at 15:33

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