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Excerpts from this Manual

14.7.5.21 SHOW GRANTS Syntax

SHOW GRANTS [FOR user]

This statement displays the GRANT statement or statements that must be issued to duplicate the privileges that are granted to a MySQL user account. SHOW GRANTS requires the SELECT privilege for the mysql database, except to see the privileges for the current user.

For output that includes an IDENTIFIED BY PASSWORD clause displaying an account password hash value, the SUPER privilege is required to see the actual hash value. Otherwise, the value displays as <secret>.

To name the account, use the same format as for the GRANT statement; for example, 'jeffrey'@'localhost'. If you specify only the user name part of the account name, a host name part of '%' is used. For additional information about specifying account names, see Section 14.7.1.4, “GRANT Syntax”.

mysql> SHOW GRANTS FOR 'root'@'localhost';
+---------------------------------------------------------------------+
| Grants for root@localhost                                           |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
+---------------------------------------------------------------------+

To display the privileges granted to the account that you are using to connect to the server, you can use any of the following statements:

SHOW GRANTS;
SHOW GRANTS FOR CURRENT_USER;
SHOW GRANTS FOR CURRENT_USER();

If SHOW GRANTS FOR CURRENT_USER (or any of the equivalent syntaxes) is used in DEFINER context, such as within a stored procedure that is defined with SQL SECURITY DEFINER), the grants displayed are those of the definer and not the invoker.

SHOW GRANTS displays only the privileges granted explicitly to the named account. Other privileges that might be available to the account are not displayed. For example, if an anonymous account exists, the named account might be able to use its privileges, but SHOW GRANTS will not display them.

As of MySQL 5.7.6, SHOW GRANTS output does not include IDENTIFIED BY PASSWORD clauses. Use the SHOW CREATE USER statement instead. See Section 14.7.5.12, “SHOW CREATE USER Syntax”.

To display nonprivilege information for MySQL accounts, use the SHOW CREATE USER statement.


User Comments
  Posted by on August 21, 2003
Selecting everything from mysql.user isn't quite the same as doing a SHOW GRANTS for user@host. Ideally, MySQL should allow a subquery on "show", where you could do "SHOW grants for (select concat(user,'@',host) from mysql.user)". However, until then, this Perl script might help (substitute "youruser" and "yourpassword" with details of a suitably privileged user):

#!/usr/bin/perl -w

use strict;
use DBI;
use Text::Wrap qw($columns &wrap);

my $dbase = "mysql";
my $dbuser = "youruser";
my $dbpassword = "yourpassword";
my $dbhost = "localhost";

my $dbh;
$dbh = DBI->connect( "DBI:mysql:$dbase:$dbhost", $dbuser, $dbpassword ) or die "can't open database ", $dbh->errstr, __LINE__;

my $statement = qq|SELECT User, Host from user |;

my $que = $dbh->prepare($statement);
my $result = $que->execute or die "error on database statement ", $que->errstr, __LINE__;
my $tmp;
my $columns = 120;

while ( $tmp = $que->fetchrow_hashref ) {

my $statement2 = qq| SHOW GRANTS for | . "'" . $tmp->{User} . "'\@'" . $tmp->{Host} . "'";

my $que2 = $dbh->prepare($statement2);
my $result2 = $que2->execute or die "error on database statement ", $que2->errstr, __LINE__;

print qq(Privileges for $tmp->{User}\@$tmp->{Host}:\n\n);

while ( my $tmp2 = $que2->fetchrow_hashref ) {

print wrap( "", "", $tmp2->{ "Grants for $tmp->{User}\@$tmp->{Host}" } ), "\n\n";

}
print "-" x 120, "\n\n";

}

  Posted by Norbert Kremer on October 20, 2003
The perl script provided by simon.ransome is very good, and runs as is. However, the print formatting is not perfect. I think the author intended the $columns variable to set the width of wrapping. If you remove the "my" from this line: my $columns = 120; then the script will work as the author intended. (in my case, I wanted to wrap at 200). Also, the line print "-" x 120, "\n\n"; could be changed to print "-" x $columns, "\n\n"; so that the separator bar will be the same width as the wrapped text. Finally, it's not a bad idea to put this at the end of the script (will occur implicitly, but I like to clean up anyway) $dbh->disconnect;


  Posted by Sylvain Viart on October 11, 2006
Hi

Here is a small shell scrip which might also help.

#!/bin/bash
tmp=/tmp/showgrant$$
mysql --batch --skip-column-names -e "SELECT user, host FROM user" mysql > $tmp
cat $tmp | while read user host
do
echo "# $user @ $host"
mysql --batch --skip-column-names -e"SHOW GRANTS FOR '$user'@$host"
done
rm $tmp

  Posted by Guy Baconnière on October 27, 2006
;-)

mysql -B -N -e "SELECT DISTINCT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') AS query FROM user" mysql | mysql

  Posted by Guy Baconniere on October 21, 2008
Hi,

If you want to backup your MySQL grants this is a way to do it.

You need to create a ~/.my.cnf or add --user=<username> --password=<password> next to mysql

# ~/.my.cnf
[client]
user="root"
password="********"

To backup grants execute the following on your shell

mysql --batch --skip-column-names --execute="SELECT DISTINCT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') AS query FROM user" mysql | mysql --batch --skip-column-names mysql | perl -p -e '$_ =~ s/$/;/; END { print "FLUSH PRIVILEGES;\n" }' > mysql-grants.sql

To backup the corresponding revokes execute the following on your shell

mysql --batch --skip-column-names --execute="SELECT DISTINCT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') AS query FROM user" mysql | mysql --batch --skip-column-names mysql | perl -p -e 'if(/.root.\@.localhost./) { $_ = undef; } else { $_ =~ s/$/;/; $_ =~ s/^GRANT /REVOKE /; $_ =~ s/ TO / FROM /; $_ =~ s/.+ FROM (.+) IDENTIFIED BY .+/-- DROP USER $1;/; } END { print "FLUSH PRIVILEGES;\n" }' > mysql-revokes.sql

If you want to drop users remove "--" before each "DROP USER". Please note I have excluded 'root'@'localhost' for safety reason ;-P

Best Regards,
Guy Baconniere
  Posted by Jorge Torralba on February 2, 2011
This shell scripit I created allows you to show grants for a user and generate the sql to reproduce it. If you pass a 2nd argument, It will take the grants for the first user (arg1) and create them for the 2nd user (arg2).

clear;

username=$1
newname=$2

X="X"$1
Y="X"$2

if [ $X = "X" ]; then
echo
echo "You must provide a username or partial username to use."
echo
echo "showgrants.sh username1 [username2]"
echo
echo "If only username1 is passed, all privileges for username1 will be listed as sql statements."
echo "If username1 and username2 are passeed, all privileges for username1 will be mimicked by username2."
echo "This would include passwords and hosts when available."
echo
fi

passwd="*****"
pid=$$
file1="/tmp/$pid"
file2="/tmp/$pid"2

echo "create temporary table tempuser ( user varchar(30) );
insert into tempuser select distinct user from user where user like '$username%';
select concat(\"show grants for '\",tempuser.user, \"'@'\",host,\"';\") from tempuser, user where user.user = tempuser.user;" | mysql mysql -u root -p$passwd --skip-column-names > $file1

mysql mysql -u root -p$passwd --skip-column-names < $file1 > $file2

if [ $Y != "X" ]; then
cat $file2 | sed 's/$/;/g' | sed "s/${username}[^']*./${newname}/g"
fi

if [ $Y = "X" ]; then
cat $file2 | sed 's/$/;/g'
fi

rm -f $file1
rm -f $file2

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