04-27-2020
Quote:
...
I think the first line skips over the tnsnames.ora until it finds a pattern 'variable ='. So this will give us the left hand side in $1?
The second line searches for the SERVICE_NAME entry, where the value matches s, which is set on the command line to be 'pri'.
You store this in $1 ....but didn't we keep the left hand side there?
... I do not understand the third line at all.
I forgot that
( is special in ERE, that awk uses. You found it: needs to be escaped. An alternative would be
[(].
Each code line is a
condition { action }.
All three code lines are run for each input line.
If the condition in the 2nd code line is true it performs the action: print variable
a.
This is set in the 3rd code line to field#1, if it does not have a
( at the beginning.
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LEARN ABOUT FREEBSD
ftpchroot
FTPCHROOT(5) BSD File Formats Manual FTPCHROOT(5)
NAME
ftpchroot -- list users and groups subject to FTP access restrictions
DESCRIPTION
The file ftpchroot is read by ftpd(8) at the beginning of an FTP session, after having authenticated the user. Each line in ftpchroot corre-
sponds to a user or group. If a line in ftpchroot matches the current user or a group he is a member of, access restrictions will be applied
to this session by changing its root directory with chroot(2) to that specified on the line or to the user's login directory.
The order of records in ftpchroot is important because the first match will be used. Fields on each line are separated by tabs or spaces.
The first field specifies a user or group name. If it is prefixed by an ``at'' sign, '@', it specifies a group name; the line will match
each user who is a member of this group. As a special case, a single '@' in this field will match any user. A username is specified other-
wise.
The optional second field describes the directory for the user or each member of the group to be locked up in using chroot(2). Be it omit-
ted, the user's login directory will be used. If it is not an absolute pathname, then it will be relative to the user's login directory. If
it contains the /./ separator, ftpd(8) will treat its left-hand side as the name of the directory to do chroot(2) to, and its right-hand side
to change the current directory to afterwards.
FILES
/etc/ftpchroot
EXAMPLES
These lines in ftpchroot will lock up the user ``webuser'' and each member of the group ``hostee'' in their respective login directories:
webuser
@hostee
And this line will tell ftpd(8) to lock up the user ``joe'' in /var/spool/ftp and then to change the current directory to /joe, which is rel-
ative to the session's new root:
joe /var/spool/ftp/./joe
And finally the following line will lock up every user connecting through FTP in his respective ~/public_html, thus lowering possible impact
on the system from intrinsic insecurity of FTP:
@ public_html
SEE ALSO
chroot(2), group(5), passwd(5), ftpd(8)
BSD
January 26, 2003 BSD