Package: coreutils Version: 9.1-1 Version: 9.4-3 Severity: normal Dear Maintainer,
POSIX.1-202x/D3: −t char Use character char as a separator, for both input and output. Every appearance of char in a line shall be significant. When this option is specified, the collating sequence shall be the same as sort without the −b option. so obviously allowing -t '' is an extension. Manual: -t CHAR use CHAR as input and output field separator Important: FILE1 and FILE2 must be sorted on the join fields. E.g., use "sort -k 1b,1" if 'join' has no options, or use "join -t ''" if 'sort' has no options. Note, comparisons honor the rules specified by 'LC_COLLATE'. If the input is not sorted and some lines cannot be joined, a warning message will be given. So given $ cat f1 row1 f1 1 urow1 f1 2 $ cat f2 row1 f2 1 urow2 f2 2 which are stable against both sort and sort -k 1b,1 $ join f? row1 f1 1 f2 1 $ join f? -t ' ' row1 f1 1 f2 1 is all as expected. But $ join f? -t '' returns empty. What would empty -t mean, anyway? The empty string can either be found at every position (clearly not the case here, otherwise this'd be joined on r and u) or at no positions, so $ cat g1 row1 urow1 $ cat g2 row1 urow2 $ join g? -t '' row1 which is, well $ comm g? -12 row1 Somehow I don't feel like this is a good recommendation? Best, наб -- System Information: Debian Release: 12.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.1.0-12-amd64 (SMP w/24 CPU threads; PREEMPT) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages coreutils depends on: ii libacl1 2.3.1-3 ii libattr1 1:2.5.1-4 ii libc6 2.36-9+deb12u4 ii libgmp10 2:6.2.1+dfsg1-1.1 ii libselinux1 3.4-1+b6 coreutils recommends no packages. coreutils suggests no packages. -- no debconf information
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