[Tutor] SyntaxError: can't assign to literal while using ""blkid -o export %s | grep 'TYPE' | cut -d"=" -f3" % (fs)" using subprocess module in Python

[Ben Bacarisse]

srinivasan <srinivasan.rns at gmail.com> writes:

> Even after changing as per the below
> "blkid -o export %s | grep 'TYPE' | cut -d'=' -f3"
> or:
> 'blkid -o export %s | grep "TYPE" | cut -d"=" -f3'
> or:
> "blkid -o export %s | grep \"TYPE\" | cut -d\"=\" -f3"
>
> Still my output is:
> */dev/mmcblk1p1: LABEL="efi" UUID="1084-AA42" TYPE="vfat"*
>
> My expected output should be only:
> *vfat*
>
> Could you guys please do the needful?

Why not

  blkid %s -o value --match-tag TYPE

?  Or, better still,

  lsblk %s -n -o FSTYPE

It's not easy to answer your question about fixing the line you have,
because the output you are getting it not consistent with what you are
showing.  (And I can't find the original post that presumably has Python
code I could run myself.)

The format I get with -o export is:

DEVNAME=/dev/sda1
UUID=2726bf5f-2655-4986-815d-e4532374f218
TYPE=ext3
PARTUUID=000453d3-01

for which

  "blkid %s -o export | grep TYPE | cut -c6-"

would work.  Alternatively I get the result you want from

  "blkid %s -o export | grep TYPE | cut -d= -f2"

Note that "TYPE" and "=" don't really need to be quoted at all.

Someone suggested sed, and that too can be used like this:

  blkid %s -o export | sed -ne '/TYPE=/s///p'

-- 
Ben.