android - How to read a file extension from a variable in Bash? -


i working on major update android utility flash in recovery , uses bash scripting... problem is, kinda know nothing bash!

right now, have 2 files... common file contains variables , script file holds file lists.

here problem part of common script:

 if [ ${android_version} == 5.* ];     rm -rf /system/$file_name;     else         if [ -e ${file_name}.* ];             rm -rf /system/$file_name;         else             rm -f /system/$file_name.apk;         fi;     fi;

and here's example of $file_name's come from:

# aosp aosp_remove_list="bootanimation browser ...";  bootanimation_list="media/bootanimation.zip";  browser_list="app/browser app/chromebookmarkssyncadapter";

so in common file, looks see if lollipop. if not, (this issue) supposed @ file name individual app lists , see if contains file extension. if doesn't remove $file_name + .apk.

so in above example, browser's files .apk added , removed system bootanimation .zip doesn't removed.

you should maybe use suffix truncation perform this.

with ${your_var_name%.zip} you'll ride of after .zip including zip, if present of course.

you can try in terminal:

a="toto.zip" echo ${a%.zip}  #= > toto

you'll more details possibilities here: http://www.tldp.org/ldp/abs/html/parameter-substitution.html


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