Pavel - if your setup can run pdftex ..., I surmise it can run
env max_print_line=9999 pdftex ... That should be portable to everything
except Windows; I have no good solution for Windows, sorry.
Does not "set max_print_line=9999" have the same effect for the Windows CMD command-line interpreter ? I
assume that "env" is Unix's typically cryptic way of setting environment variables.
[1]
D:\>set max_print_line=9999
D:\>pdftex
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=pdftex)
restricted \write18 enabled.
**\wlog {abcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnop}
entering extended mode
abcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnop
[2]
D:\>set max_print_line=99
D:\>pdftex
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=pdftex)
restricted \write18 enabled.
**\wlog {abcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnop}
entering extended mode
abcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnopabc
defghijklmnopabcdefghijklmnopabcdefghijklmnopabcdefghijklmnop