Can't convert image file using a bash script

[Boogal]

How did you create the shell script file? If you used Windows tools, line-ends are probably marked with carriage-return and line-feed, but bash normally expects just line-feed, and you need to tell it to ignore carriage-return. See IM with Cygwin: Line ends for workarounds.

This solved it, thanks so much.

edit: a friend told me I should add to this in case any future folks find this googling:

I ended up just adding the following to lines to my bash_profile for cygwin:

Code: Select all

export SHELLOPTS
set -o igncr

to universally ignore carriage returns.

[snibgo]

Good stuff. I suggest you review all my comments in IM with Cygwin. I documented the problems I found, with solutions, to save other people hitting them.

[bratpit]

Read what bash telling you.

est.sh: line 3: -4: substring expression < 0

this means bash not allow negative values in substring expansion.
This works in bash > 4.2.
Probably your bash in Cygwin is < 4.2.


Check this parametr expansion:

${1%.*}palette.png

if not this old-school
works in bash, sh, ash, dash, busybox/ash, zsh, ksh, etc.

${1%?}palette.png

[bratpit]

duplicate prev. post

[fmw42]

This works on my Mac: ${1%.*}

This does not work on my Mac: ${1::-4}

Unfortunately, Apple provides only older versions of bash on my 2014 Mac Mini. My bash is 3.2.57

[bratpit]

Fortunatelly there is several ways to do the same in bash