cat vs head vs readline get variable from txt file

Shell Programming and Scripting
1

I have a file with a single filename in it, which I want to assign to a BASH variable, so I've been trying:

c=$(head -1 somefile)
echo $c

which outputs correctly, but them when I do

...
somecommand $c

it says it can't find the file, is that because it's grabbing the whole line, and how should I be doing it different, grep maybe?

2

whats that somecommand?? and is that file available on the dir where you are running that script??

3 
#!/bin/bash
c=$(head -1 toconvertfile)
ffmpeg -i $c -an -pass 1 -vcodec libx264 -vpre fastfirstpass -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $c.tempfile
ffmpeg -i $c -acodec libfaac -ab 64k -pass 2 -vcodec libx264 -vpre hq -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $c.flv
rm $c.tempfile
ffmpeg -i $c.flv -s 174x116 -an -ss 5 -vframes 1 -f image2 -y $c.flv.jpg

#: cat toconvertfile
test1.avi

#: ls test1.*
test1.avi

if I just use

#!/bin/bash
ffmpeg -i $1 -an -pass 1 -vcodec libx264 -vpre fastfirstpass -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $1.tempfile
ffmpeg -i $1 -acodec libfaac -ab 64k -pass 2 -vcodec libx264 -vpre hq -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $1.flv
rm $1.tempfile
ffmpeg -i $1.flv -s 174x116 -an -ss 5 -vframes 1 -f image2 -y $1.flv.jpg

with

#: ./conv.sh test1.avi

it works

4

can you post the out put of

cat -vet toconvertfile
c=$(head -1 toconvertfile)
echo "$c"|cat -vet
echo "$c"
5 
# cat -vet toconvertfile
test1.avi$
# c=$(head -1 toconvertfile)
# echo "$c"|cat -vet
test1.avi$
t# echo "$c"
test1.avi
6

okay, well I got it to work, thanks for the help, the final code is this:

#!/bin/bash
while [ 1 = 1 ]
 do
    c=$(head -1 toconvertfile)
  for i in $c
    do
      ffmpeg -i $c -an -pass 1 -vcodec libx264 -vpre fastfirstpass -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $c.tempfile
      ffmpeg -i $c -acodec libfaac -ab 64k -pass 2 -vcodec libx264 -vpre hq -b 512000 -bt 512000 -threads 0 -s 600x400 -r 30 -f flv $c.flv
      ffmpeg -i $c.flv -s 174x116 -an -ss 5 -vframes 1 -f image2 -y $c.flv.jpg
      rm $c.tempfile
      cat /dev/null > toconvertfile
      done
sleep 30
done