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24 lines
632 B
Markdown
24 lines
632 B
Markdown
# Create A File Descriptor with Process Substitution
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Process substitution can be used to create a file descriptor from the
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evaluation of a shell command. The syntax for process substitution is
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`<(LIST)` where `LIST` is one or more bash commands.
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```
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$ cat <(echo 'hello, world')
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hello, world
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```
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This is particularly useful for commands that expect files, such as diff:
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```
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$ diff <(echo 'hello, world') <(echo 'hello, mars')
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1c1
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< hello, world
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---
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> hello, mars
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```
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Sources: [Brian Dunn](https://twitter.com/higgaion) and
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[Bash Guide for Beginners](http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html#sect_03_04_07)
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