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Windows Terminal skip and/or truncate outputs #23971

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opened 2026-01-31 08:57:44 +00:00 by claunia · 2 comments
claunia commented 2026-01-31 08:57:44 +00:00
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Originally created by @dragon-archer on GitHub (Jan 15, 2026).

Windows Terminal version

1.23.13503.0

Windows build number

10.0.26100.7462

Other Software

upx (https://github.com/upx/upx) v5.0.2 built by either MSYS2 or MSVC

Steps to reproduce

See https://github.com/upx/upx/issues/953 for more details

To be short, run upx --help in any shell (cmd, powershell, msys2 shell, ...) under Windows Terminal, the output will be truncated, and some outputs from previous commands will be overwritten.

However, run upx --help from conhost.exe or winpty.exe is fine. Also, upx--help | less or upx --help > upx.log are also fine.

Below is the output using script from MSYS2

$ script
Script started, output log file is 'typescript'.
$ upx --help
    i386-darwin.macho                    macho/i386
    i386-dos32.djgpp2.coff               djgpp2/coff
    i386-dos32.tmt.adam                  tmt/adam
    i386-dos32.watcom.le                 watcom/le
    i386-freebsd.elf                     freebsd/i386
    i386-linux.elf                       linux/i386
    i386-linux.elf.execve                linux.exec/i386
    i386-linux.elf.shell                 linux.sh/i386
    i386-linux.kernel.bvmlinuz           bvmlinuz/i386
    i386-linux.kernel.vmlinux            vmlinux/i386
    i386-linux.kernel.vmlinuz            vmlinuz/i386
    i386-netbsd.elf                      netbsd/i386
    i386-openbsd.elf                     openbsd/i386
    i386-win32.pe                        win32/pe
    m68k-atari.tos                       atari/tos
    mips-linux.elf                       linux/mips
    mipsel-linux.elf                     linux/mipsel
    mipsel.r3000-ps1                     ps1/exe
    powerpc-darwin.macho                 macho/ppc32
    powerpc-linux.elf                    linux/ppc32
    powerpc-linux.kernel.vmlinux         vmlinux/ppc32
    powerpc64-linux.elf                  linux/ppc64
    powerpc64le-linux.elf                linux/ppc64le
    powerpc64le-linux.kernel.vmlinux     vmlinux/ppc64le
    riscv64-linux.elf                    linux/riscv64

UPX comes with ABSOLUTELY NO WARRANTY; for details visit https://upx.github.io
$ exit
exit
Script done.
$ cat -v typescript
Script started on 2026-01-16 02:27:45+08:00 [TERM="xterm-256color" TTY="/dev/pty2" COLUMNS="169" LINES="49"]
^[[?2004h$ upx --help^M
^[[?2004l^M^[[6n^[[6n^[[?9001h^[[?1004h^[[m^[[?25h^[[38;5;2m                       Ultimate Packer for eXecutables^M^[[m^[[38;5;11m^[[m    i386-darwin.macho                    macho/i386^[[K^M
    i386-dos32.djgpp2.coff               djgpp2/coff^[[K^M
    i386-dos32.tmt.adam                  tmt/adam^[[K^M
    i386-dos32.watcom.le                 watcom/le^[[K^M
    i386-freebsd.elf                     freebsd/i386^[[K^M
    i386-linux.elf                       linux/i386^[[K^M
    i386-linux.elf.execve                linux.exec/i386^[[K^M
    i386-linux.elf.shell                 linux.sh/i386^[[K^M
    i386-linux.kernel.bvmlinuz           bvmlinuz/i386^[[K^M
    i386-linux.kernel.vmlinux            vmlinux/i386^[[K^M
    i386-linux.kernel.vmlinuz            vmlinuz/i386^[[K^M
    i386-netbsd.elf                      netbsd/i386^[[K^M
    i386-openbsd.elf                     openbsd/i386^[[K^M
    i386-win32.pe                        win32/pe^[[K^M
    m68k-atari.tos                       atari/tos^[[K^M
    mips-linux.elf                       linux/mips^[[K^M
    mipsel-linux.elf                     linux/mipsel^[[K^M
    mipsel.r3000-ps1                     ps1/exe^[[K^M
    powerpc-darwin.macho                 macho/ppc32^[[K^M
    powerpc-linux.elf                    linux/ppc32^[[K^M
    powerpc-linux.kernel.vmlinux         vmlinux/ppc32^[[K^M
    powerpc64-linux.elf                  linux/ppc64^[[K^M
    powerpc64le-linux.elf                linux/ppc64le^[[K^M
    powerpc64le-linux.kernel.vmlinux     vmlinux/ppc64le^[[K^M
    riscv64-linux.elf                    linux/riscv64^[[K^M
^[[K^M
UPX comes with ABSOLUTELY NO WARRANTY; for details visit https://upx.github.io^[[K^M
^[[K^[[?9001l^[[?1004l^[[?2004h$ exit^M
^[[?2004l^Mexit^M

Script done on 2026-01-16 02:27:50+08:00 [COMMAND_EXIT_CODE="0"]

Expected Behavior

Run upx --help from Windows Terminal display correctly/

Actual Behavior

Described above.

Originally created by @dragon-archer on GitHub (Jan 15, 2026). ### Windows Terminal version 1.23.13503.0 ### Windows build number 10.0.26100.7462 ### Other Software upx (https://github.com/upx/upx) v5.0.2 built by either MSYS2 or MSVC ### Steps to reproduce See https://github.com/upx/upx/issues/953 for more details To be short, run `upx --help` in any shell (cmd, powershell, msys2 shell, ...) under Windows Terminal, the output will be truncated, and some outputs from previous commands will be overwritten. However, run `upx --help` from conhost.exe or winpty.exe is fine. Also, `upx--help | less` or `upx --help > upx.log` are also fine. Below is the output using `script` from MSYS2 ``` $ script Script started, output log file is 'typescript'. $ upx --help i386-darwin.macho macho/i386 i386-dos32.djgpp2.coff djgpp2/coff i386-dos32.tmt.adam tmt/adam i386-dos32.watcom.le watcom/le i386-freebsd.elf freebsd/i386 i386-linux.elf linux/i386 i386-linux.elf.execve linux.exec/i386 i386-linux.elf.shell linux.sh/i386 i386-linux.kernel.bvmlinuz bvmlinuz/i386 i386-linux.kernel.vmlinux vmlinux/i386 i386-linux.kernel.vmlinuz vmlinuz/i386 i386-netbsd.elf netbsd/i386 i386-openbsd.elf openbsd/i386 i386-win32.pe win32/pe m68k-atari.tos atari/tos mips-linux.elf linux/mips mipsel-linux.elf linux/mipsel mipsel.r3000-ps1 ps1/exe powerpc-darwin.macho macho/ppc32 powerpc-linux.elf linux/ppc32 powerpc-linux.kernel.vmlinux vmlinux/ppc32 powerpc64-linux.elf linux/ppc64 powerpc64le-linux.elf linux/ppc64le powerpc64le-linux.kernel.vmlinux vmlinux/ppc64le riscv64-linux.elf linux/riscv64 UPX comes with ABSOLUTELY NO WARRANTY; for details visit https://upx.github.io $ exit exit Script done. $ cat -v typescript Script started on 2026-01-16 02:27:45+08:00 [TERM="xterm-256color" TTY="/dev/pty2" COLUMNS="169" LINES="49"] ^[[?2004h$ upx --help^M ^[[?2004l^M^[[6n^[[6n^[[?9001h^[[?1004h^[[m^[[?25h^[[38;5;2m Ultimate Packer for eXecutables^M^[[m^[[38;5;11m^[[m i386-darwin.macho macho/i386^[[K^M i386-dos32.djgpp2.coff djgpp2/coff^[[K^M i386-dos32.tmt.adam tmt/adam^[[K^M i386-dos32.watcom.le watcom/le^[[K^M i386-freebsd.elf freebsd/i386^[[K^M i386-linux.elf linux/i386^[[K^M i386-linux.elf.execve linux.exec/i386^[[K^M i386-linux.elf.shell linux.sh/i386^[[K^M i386-linux.kernel.bvmlinuz bvmlinuz/i386^[[K^M i386-linux.kernel.vmlinux vmlinux/i386^[[K^M i386-linux.kernel.vmlinuz vmlinuz/i386^[[K^M i386-netbsd.elf netbsd/i386^[[K^M i386-openbsd.elf openbsd/i386^[[K^M i386-win32.pe win32/pe^[[K^M m68k-atari.tos atari/tos^[[K^M mips-linux.elf linux/mips^[[K^M mipsel-linux.elf linux/mipsel^[[K^M mipsel.r3000-ps1 ps1/exe^[[K^M powerpc-darwin.macho macho/ppc32^[[K^M powerpc-linux.elf linux/ppc32^[[K^M powerpc-linux.kernel.vmlinux vmlinux/ppc32^[[K^M powerpc64-linux.elf linux/ppc64^[[K^M powerpc64le-linux.elf linux/ppc64le^[[K^M powerpc64le-linux.kernel.vmlinux vmlinux/ppc64le^[[K^M riscv64-linux.elf linux/riscv64^[[K^M ^[[K^M UPX comes with ABSOLUTELY NO WARRANTY; for details visit https://upx.github.io^[[K^M ^[[K^[[?9001l^[[?1004l^[[?2004h$ exit^M ^[[?2004l^Mexit^M Script done on 2026-01-16 02:27:50+08:00 [COMMAND_EXIT_CODE="0"] ``` ### Expected Behavior Run `upx --help` from Windows Terminal display correctly/ ### Actual Behavior Described above.
claunia added the Needs-TriageIssue-BugNeeds-Author-FeedbackNo-Recent-Activity labels 2026-01-31 08:57:45 +00:00
claunia commented 2026-01-31 08:57:46 +00:00
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@DHowett commented on GitHub (Jan 15, 2026):

I'm sorry. When I run upx --help (5.1.0) from PowerShell, I can't see any truncation. This may be an issue in ConPTY which has been fixed since Windows last updated. This is an ongoing issue which we're trying to get hold of.

@DHowett commented on GitHub (Jan 15, 2026): I'm sorry. When I run `upx --help` (5.1.0) from PowerShell, I can't see any truncation. This may be an issue in ConPTY which has been fixed since Windows last updated. This is an ongoing issue which we're trying to get hold of.
claunia commented 2026-01-31 08:57:46 +00:00
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@microsoft-github-policy-service[bot] commented on GitHub (Jan 25, 2026):

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment.

@microsoft-github-policy-service[bot] commented on GitHub (Jan 25, 2026): This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for **4 days**. It will be closed if no further activity occurs **within 3 days of this comment**. <!-- Policy app identification https://img.shields.io/static/v1?label=PullRequestIssueManagement. -->
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Reference: starred/terminal#23971
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