26 Feb
2013
26 Feb
'13
6:15 p.m.
Hello,
I am using a script where I check if /home and /backup are present in /etc/mtab but
can't manage the 'and' operator in grep. Currently I use the 'if grep -q
"/home" ; then ......... then I do 'fi' and again 'if grep -q
"/backup" to finally go to my commands. I tried to make grep do the AND combo
but got errors as it works only on one line. I want my command to start only if both /home
and /backup are present in mtab. With my dual check method it works, but I want a clean
lean script.
Regards,
Rony.
26 Feb
26 Feb
7:36 p.m.
Here you go.....
mount | grep -q home
HOMESTATUS=$?
mount | grep -q backup
BACKUPSTATUS=$?
if [ $HOMESTATUS -eq 0 -a $BACKUPSTATUS -eq 0 ]; then
echo "You got both man, do your thing..."
exit 0;
else
echo "Error -- either home or backup missing -- Or is it BOTH !%$!!@#%!"
exit 1;
fi
Regards
R. K. Rajeev
P.S. : Dont rely too much on mtab, a read only filesystem situation
might mean you have old/stale data in it, always pipe live mount
command or use /proc/mounts.
On 26 February 2013 23:45, gnulinuxist(a)gmail.com <gnulinuxist(a)gmail.com> wrote:
Hello,
I am using a script where I check if /home and /backup are present in /etc/mtab but
can't manage the 'and' operator in grep. Currently I use the 'if grep -q
"/home" ; then ......... then I do 'fi' and again 'if grep -q
"/backup" to finally go to my commands. I tried to make grep do the AND combo
but got errors as it works only on one line. I want my command to start only if both /home
and /backup are present in mtab. With my dual check method it works, but I want a clean
lean script.
Regards,
Rony.
--
http://mm.ilug-bom.org.in/mailman/listinfo/linuxers
8 p.m.
On 26 February 2013 23:45, gnulinuxist(a)gmail.com <gnulinuxist(a)gmail.com> wrote:
Hello,
I am using a script where I check if /home and /backup are present in /etc/mtab but
can't manage the 'and' operator in grep. Currently I use the 'if grep -q
"/home" ; then ......... then I do 'fi' and again 'if grep -q
"/backup" to finally go to my commands. I tried to make grep do the AND combo
but got errors as it works only on one line. I want my command to start only if both /home
and /backup are present in mtab. With my dual check method it works, but I want a clean
lean script.
Regards,
Rony.
--
http://mm.ilug-bom.org.in/mailman/listinfo/linuxers
Here you go.....
mount | grep -q home
HOMESTATUS=$?
mount | grep -q backup
BACKUPSTATUS=$?
if [ $HOMESTATUS -eq 0 -a $BACKUPSTATUS -eq 0 ]; then
echo "You got both man, do your thing..."
exit 0;
else
echo "Error -- either home or backup missing -- Or is it BOTH !%$!!@#%!"
exit 1;
fi
Regards
R. K. Rajeev
P.S. : Dont rely too much on mtab, a read only filesystem situation
might mean you have old/stale data in it, always pipe live mount
command or use /proc/mounts.
27 Feb
27 Feb
5:11 a.m.
On 26 February 2013 23:45, gnulinuxist(a)gmail.com <gnulinuxist(a)gmail.com> wrote:
I am using a script where I check if /home and /backup
are present in /etc/mtab but can't manage the 'and' operator in grep.
Currently I use the 'if grep -q "/home" ; then ......... then I do
'fi' and again 'if grep -q "/backup" to finally go to my commands. I
tried to make grep do the AND combo but got errors as it works only on one line. I want my
command to start only if both /home and /backup are present in mtab. With my dual check
method it works, but I want a clean lean script.
How about:
if [ $( grep -cE '/(home|backup)' /etc/mtab ) = 2 ]; then
echo Found both mounts
else
echo Found only one of the two mounts
fi
(Refine as per your needs)
Binand
5:22 a.m.
On 27 February 2013 10:41, Binand Sethumadhavan <binand(a)gmail.com> wrote:
On 26 February 2013 23:45, gnulinuxist(a)gmail.com
<gnulinuxist(a)gmail.com> wrote:
Fails for Case where mount points /home and /home_new exist. Still get
count 2 with no backup. In addition, if i have /backup mounted too,
the script would actually fail, since the count now becomes 3 ! :-P
Regards
R. K. Rajeev
I am using a script where I check if /home and
/backup are present in /etc/mtab but can't manage the 'and' operator in grep.
Currently I use the 'if grep -q "/home" ; then ......... then I do
'fi' and again 'if grep -q "/backup" to finally go to my commands. I
tried to make grep do the AND combo but got errors as it works only on one line. I want my
command to start only if both /home and /backup are present in mtab. With my dual check
method it works, but I want a clean lean script.
How about:
if [ $( grep -cE '/(home|backup)' /etc/mtab ) = 2 ]; then
echo Found both mounts
else
echo Found only one of the two mounts
fi
(Refine as per your needs)
5:28 a.m.
On 27 February 2013 10:52, Rajeev R. K. <rajeevrk(a)xlncenterprises.com> wrote:
Come on man, that's why I specifically mentioned "refine to your
needs". If I were to refine this for Rony's needs as he articulated,
I'd write that regex as:
'^[^[:space:]]*[[:space:]]/(home|backup)[[:space:]]'
Which covers all the special cases you mention and some more.
Binand
How about:
if [ $( grep -cE '/(home|backup)' /etc/mtab ) = 2 ]; then
echo Found both mounts
else
echo Found only one of the two mounts
fi
(Refine as per your needs)
Fails for Case where mount points /home and /home_new exist. Still get
count 2 with no backup. In addition, if i have /backup mounted too,
5:40 a.m.
On 27 February 2013 10:58, Binand Sethumadhavan <binand(a)gmail.com> wrote:
On 27 February 2013 10:52, Rajeev R. K.
<rajeevrk(a)xlncenterprises.com> wrote:
Come on man, that's why I specifically mentioned "refine to your
needs". If I were to refine this for Rony's needs as he articulated,
I'd write that regex as:
'^[^[:space:]]*[[:space:]]/(home|backup)[[:space:]]'
Which covers all the special cases you mention and some more.
Lolz, No worries man, i was just approaching it from a design
perspective, rather than targeting code brevity. I still say having
independent tests makes most of these edge cases moot, and plus has
another important advantage from a usability perspective. It allows
you to specifically inform the user of why the script aborted,
specifically identifying which of the 2 required mount points was not
available(or both, for that matter). If the script is to fail, let it
fail with class :-)
Regards
R. K. Rajeev
How
about:
if [ $( grep -cE '/(home|backup)' /etc/mtab ) = 2 ]; then
echo Found both mounts
else
echo Found only one of the two mounts
fi
(Refine as per your needs)
Fails for Case where mount points /home and /home_new exist. Still get
count 2 with no backup. In addition, if i have /backup mounted too,
1 Mar
1 Mar
10:06 a.m.
On 26 February 2013 23:45, gnulinuxist(a)gmail.com <gnulinuxist(a)gmail.com> wrote:
I am using a script where I check if /home and /backup
are present in /etc/mtab but can't manage the 'and' operator in grep.
Just came across this one.
if mountpoint -q /home; then
echo "/home is mounted"
fi
if mountpoint -q /backup; then
echo "/backup is mounted"
fi
No hassles, no grep, no -Ecw... :-)
Binand
3861
days inactive
3864
days old
7 comments
4 participants
participants (4)
-
Binand Sethumadhavan -
gnulinuxist＠gmail.com -
Rajeev R. K. -
Rajeev R. K.