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Dominique_71
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Joined: 17 Aug 2005
Posts: 1877
Location: Switzerland (Romandie)
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 Posted: Fri Mar 08, 2019 1:50 am Post subject: backslash in volume name cause mess in the system |
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I have an USB stick with a silly volume name, and it confuse the system:
| Code: | # cat /proc/mounts
/dev/sdb1 /media/USB\134x20DISK vfat ... |
| Code: | # mount
/dev/sdb1 on /media/USB\x20DISK type vfat ... |
| Code: | # findmnt
└─/media/USB\x5cx20DISK /dev/sdb1 vfat ... |
| Code: | df -h
/dev/sdb1 7.3G 89M 7.2G 2% /media/USB\x20DISK |
4 commands and 3 different mount points into /media.
Is this a know bug?
The actual mount point is unique and is /media/USB\x20DISK. If I understand right that issue, it imply than, in scripts, I cannot rely on findmnt or the /proc/mounts file, but must use commands like mount.
EDIT: I just took a look with fdisk:
| Code: | # fdisk /dev/sdb1
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sdb1: 7.3 GiB, 7790985216 bytes, 15216768 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x73696420
Device Boot Start End Sectors Size Id Type
/dev/sdb1p1 1936286752 6221126032 4284839281 2T 45 unknown
/dev/sdb1p2 1853169786 3723051230 1869881445 891.6G 65 Novell Netware 386
/dev/sdb1p3 1701978226 3336544981 1634566756 779.4G 20 unknown
/dev/sdb1p4 2885681152 2885734079 52928 25.9M d unknown
Partition table entries are not in disk order. |
So according to fdisk, that 7.3 Gib stick have 4 partitions, one of 25.9M which seam raisonnable, a second one of 779.4G which is already surprising, a third one of 891.6G, and the fourth of amazingly 2T. Its pure magic.
And I don't see the 7.3G partition reported by df.
I know I could change these partition and reformat that disk, but it is not mine. I think it is the original partitioning of that stick, an EMTEC 8. My main concern is that mount issue, and about the best practice I can have if I want to make scripts with that mess.
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"Confirm You are a robot." - the singularity |
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russK
l33t
Joined: 27 Jun 2006
Posts: 665
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| Posted: Fri Mar 08, 2019 2:35 am Post subject: |
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Dominique_71,
I believe this is not a bug, it is a feature in each case 
Check 'man ascii', search for '5C': | Code: | ... snip ...
032 26 1A SUB (substitute) 132 90 5A Z
033 27 1B ESC (escape) 133 91 5B [
034 28 1C FS (file separator) 134 92 5C \ '\\'
035 29 1D GS (group separator) 135 93 5D ]
036 30 1E RS (record separator) 136 94 5E ^
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\134 is octal for '\'
x5C is hex for '\'
The string 'USB\x20DISK' is the "correct" string. Each tool shows you a correct version of the name. Pick the one you most prefer. 
You may also find it interesting: | Code: | $ cd /media
$ ls -N | grep USB
USB\x20DISK
$ ls -b | grep USB
USB\\x20DISK
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Did you mean to use 'fdisk /dev/sdb' or 'fdisk /dev/sdb1'?
HTH |
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Dominique_71
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Joined: 17 Aug 2005
Posts: 1877
Location: Switzerland (Romandie)
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| Posted: Fri Mar 08, 2019 4:55 am Post subject: |
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| russK wrote: | Dominique_71,
\134 is octal for '\'
x5C is hex for '\'
The string 'USB\x20DISK' is the "correct" string. Each tool shows you a correct version of the name. Pick the one you most prefer. |
OK I get it. It's so simple when we know what this is. In my case, as the issue I get into a script is the '\', it will change nothing. And now, it is fixed.
| russK wrote: | You may also find it interesting: | Code: | $ cd /media
$ ls -N | grep USB
USB\x20DISK
$ ls -b | grep USB
USB\\x20DISK
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So, with 'ls -b', the escape is escaped. 
| Quote: | Did you mean to use 'fdisk /dev/sdb' or 'fdisk /dev/sdb1'?
HTH |
My mistake! 
And thank you russK!
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