Bash script different output when doubleclick vs. run in terminal -

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i have script (among others) generates wallpaper upon every login/midnight. has 755 permissions. part of code:

#/bin/bash  convert -size 1440x900 xc:none wall.png composite -gravity center ../pics/im256.png wall.png wall.png composite -geometry 118x67+661+578 ../pics/im-title-white.png wall.png wall.png  time=`$home/bin/time.py | grep "\."`  if [[ $time == *\'* ]]     # <...1...> else     # <...2...> fi

i'm interested if $time variable has ' symbols in it. when there no ' symbols - good.

now when know there @ least 1 ' symbol (or can force make way), when double-click script find myself in else statement, when run script in terminal - find myself in then statement. then statement, how?

i cropped part failing (left - correct, right - wrong):

correct image wrong picture

it took me write post until notice shebang not shebang. #!/bin/bash fixed problem.

it appears incorrect shebang defaulted /bin/sh incapable of running correctly. login shell /bin/bash means running shell without bash keyword eg.: ./script.sh defaults bash , not sh. why couldn't same on double-click..


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