Am 28.02.22 um 05:45 schrieb Robert Nichols:
On 2/27/22 12:26 PM, centos@xxxxxxx wrote:
Am 27.02.22 um 04:33 schrieb Robert Nichols:
Does anything for CentOS 8 provide the function of the fstab-decode
utility?
Entries in /proc/mounts and /etc/fstab can have escape sequences for
certain special characters, and I need to decode that.
Preface: Never heard of fstab-decode before. Researching the command
made me really wonder why it was invented. Especially since I have
never seen an /etc/fstab with "escape sequences" or "special
characters" since at least 1990 (If I am wrong: Please show me such a
fstab file).
So why not just use:
umount $(awk '$3 == "vfat" {print $2}' /etc/fstab)
instead of the seemingly canonical use of fstab-decode
fstab-decode umount $(awk '$3 == "vfat" { print $2 }' /etc/fstab)
Those samples break if the mount point directory name contains spaces,
tabs, or whatever other characters I don't know about that also get
represented by escape sequences. I'm not actually using it with
/etc/fstab, but with /proc/mounts which uses the same convention. I
can control /etc/fstab and avoid the problem, but I cannot control how
some auto-mounted foreign filesystem might be named. I have a script
that needs to be robust in the face of such names.
Get creative! Unix administration is a creative job. Having said this:
Using white space within mount points is asking for trouble anyway. If
you really want this in the most generic way, then do the unquoting with
something like this:
awk '$3 == "vfat" {print $2}' /etc/fstab | perl -pl000 -e
's/\\([0-7]{3})/chr(oct($1))/eg' | xargs -0 -n 1 -r umount
This seems to be the unixy way to do this.
If you really need the fstab-decode program put this in a script (if you
want to be able to use commands with arguments you may choose to remove
the double quotes in the argument to xargs):
#!/bin/bash
# a simple fstab-decode implementation....
CMD="$1"
shift
while [ -n "$1" ] ; do
echo -E "$1"
shift
done | perl -pl000 -e 's/\\([0-7]{3})/chr(oct($1))/eg;' | xargs -0 -n 1 -r "$CMD"
Peter
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