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Alpine uses BusyBox while Ubuntu uses GNU tools, and they behave differently. Intro Exit with code 1 List Intro § Skip to the list . Alpine Linux is known for its minimal size. The ‘ mini root filesystem ‘ flavour is only 2MB. This size makes it suitable as a Docker image, so CI job can start running script sooner instead of downloading larger image like Ubuntu. I use it in my urlhaus-filter repo to run the scripts (that update the filter twice a day). When I first started using it on gitlab ci (I only knew about it a week ago), my first impression was that it somehow ships with more Unix tools than Ubuntu (not technically correct which I explain later), despite its minimal size. during the setup of the repo, there were many job failure due to incorrect command options or syntax. Exit with code 1 § While setting up GitLab CI for urlhaus-filter, I encountered many issues despite tested fine on my workstation. Sifting through the error messages, I noticed the Alpine’s Unix tools behave differently than mine. I investigated further by testing the script on an Alpine VM. I compared the --version of those tools in Ubuntu and Alpine, and noticed the outputs are totally different. The Alpine tools output BusyBox vXX , which shows they are part of BusyBox. I briefly read up the wiki and noticed the following line, …compared GNU, BusyBox, asmutils and Perl implementations of the standard Unix commands… and the examples , Programs included in BusyBox can be run simply by adding their name as an argument to the BusyBox executable: /bin/busybox ls …, for example just /bin/ls after /bin/ls is linked to /bin/busybox So, Alpine uses BusyBox and Ubuntu uses GNU. Ubuntu does include BusyBox by default, but it mostly uses GNU. List § I tested the tools on Alpine and Ubuntu, and noted their behaviour. BusyBox = BB. gzip/gunzip/zcat : BB only support gzip/bzip2/xz format, use BB’s unzip for zip file. GNU can only extract the first file in a zip. unzip : GNU doesn’t support stdin as input. funzip can decompress from stdin, but only the first file (like zcat). BB support stdin and extract all files, through unzip - . sed : BB doesn’t support -z argument which is used to find/replace \n new line character. A workaround is sed ':a;N;$!ba;s/\n/ /g' file or sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g' file . GNU sed -z 's/\n/ /g' works. bsdtar : Since GNU can only extract the first file, in addition to BB’s unzip, another alternative is bsdtar. bsdtar is available through libarchive-tools package. To extract zip from stdin, use $ bsdtar -xf - . patch : BB doesn’t support --backup option. BSD doesn’t support --verbose option.