Am 02. Mar, 2019 schwätzte deb so:
moin moin,
rather than the double-reverse, try the truncate operator.
basename=${fname%.*}
$ ( fname=fred.mp4; echo ${fname%.*} )
fred
$ ( fname=fred.georg.mp4; echo ${fname%.*} )
fred.georg
$ ( fname=fred.txt; echo ${fname%.*} )
fred
$ ( fname=fred; echo ${fname%.*} )
fred
$
'%' says to look for the named pattern at the end of the value.
In this case '.*' says the last dot and everything after it if there is a
period in the value.
'%' is not greedy, so will match as little as possible, use '%%' to get
greedy if you need it.
ciao,
der.hans
On 3/2/19 8:07 PM, Roberto C. Sánchez wrote:
On Sat, Mar 02, 2019 at 07:56:58PM -0500, deb wrote:
This has to be simple and I'm just missing it.
If I pull a filename from a temp file into a variable, I can ls it
fine.
If I cut off the extension, and tack on my own SAME EXT, ls no longer
works.
(The actual script is more elaborate, loading vlc , etc -- but this
summarizes & shows my issue)
# mp4file.txt holds just 'long file with spaces.mp4'
fname=$(<mp4file.txt)
# echo $fname shows the right filename.mp4 string
# works
ls -al "$fname"
# Cut off the extension.
fname=`echo $fname | rev | cut -d. -f2 | rev`
# echo $fname shows the filename sans '.mp4'
# THIS LS FAILS, WITH FILE NOT FOUND (but actually reports the exact
string that worked above, but not being found here).
ls -al "$fname".mp4
ls: cannot access 'long file with spaces.mp4': No such file or
directory
I cannot replicate the behavior you describe. Here is how it looks for
me:
root@chroot:~# touch "long file with spaces.mp4"
root@chroot:~# echo "long file with spaces.mp4" >mp4file.txt
root@chroot:~# cat mp4file.txt
long file with spaces.mp4
root@chroot:~# ls -l
total 4
-rw-r--r-- 1 root root 0 Mar 3 01:02 long file with spaces.mp4
-rw-r--r-- 1 root root 26 Mar 3 01:02 mp4file.txt
root@chroot:~# fname=$(<mp4file.txt)
root@chroot:~# ls -al "$fname"
-rw-r--r-- 1 root root 0 Mar 3 01:02 long file with spaces.mp4
root@chroot:~# fname=`echo $fname | rev | cut -d. -f2 | rev`
root@chroot:~# ls -al "$fname".mp4
-rw-r--r-- 1 root root 0 Mar 3 01:02 long file with spaces.mp4
What version of bash are you using?
------------------------------------------------------
It is not:
* a special character thing,
* a carriage return thing,
* a character case thing,
* not helped with './' or '~/' added in front of the filename.
* It's the same string in both spots.
Any thoughts folks?
I am not sure about the overall problem, but I can say I would replace
this:
fname=`echo $fname | rev | cut -d. -f2 | rev`
with this:
fname=$(basename "$fname" .mp4)
Regards,
-Roberto
*
*
*Thank you Roberto.*
# Cut off the extension.
# fname=`echo $fname | rev | cut -d. -f2 | rev`
fname=$(basename "$fname" .mp4)
^ this does work for the *ls*, but I do not know that it will be a .mp4.
(It could be a .mkv, .webm, .ogg, .mp4, etc.)
What is certain is the filename to the left of the final '.'.
So I was building up the different choices to file test for, hence the
fname=`echo $fname | rev | cut -d. -f2 | rev`
I'm running:
cat /etc/issue
9.8
bash --version
GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
--
# https://www.LuftHans.com https://www.PhxLinux.org
# Intelligence without compassion is a waste. -- der.hans
