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* Update less-than.md * Update less-than.md --------- Co-authored-by: Machiavelli <145562237+MachiavelliII@users.noreply.github.com>
32 lines
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Markdown
32 lines
1 KiB
Markdown
# Less than
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> Redirect data to `stdin`.
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> More information: <https://gnu.org/software/bash/manual/bash.html#Redirecting-Input>.
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- Redirect a file to `stdin` (achieves the same effect as `cat file.txt |`):
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`{{command}} < {{path/to/file.txt}}`
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- Create a here document and pass that into `stdin` (requires a multiline command):
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`{{command}} << {{EOF}} <Enter> {{multiline_text}} <Enter> {{EOF}}`
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- Create a here string and pass that into `stdin` (achieves the same effect as `echo string |`):
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`{{command}} <<< {{string}}`
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- Process data from a file and write the output to another file:
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`{{command}} < {{path/to/file.txt}} > {{path/to/file2.txt}}`
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- Write a here document into a file:
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`cat << {{EOF}} > {{path/to/file.txt}} <Enter> {{multiline_data}} <Enter> {{EOF}}`
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- Disregard leading tabs (good for scripts with indentation but does not work for spaces):
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`cat <<- {{EOF}} > {{path/to/file.txt}} <Enter> {{multiline_data}} <Enter> {{EOF}}`
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- Pass command output to a program as a file descriptor:
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`diff <({{command1}}) <({{command2}})`
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