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Add 'grep . *' oneliner trick for high-level scan of a directory

pull/51/head
Adam McDaniel 2015-06-16 15:16:00 -06:00
parent cea628de68
commit d54f4f0fa4
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@ -238,6 +238,12 @@ A few examples of piecing together commands:
cat a b b | sort | uniq -u > c # c is set difference a - b cat a b b | sort | uniq -u > c # c is set difference a - b
``` ```
- Use `grep . *` to visually examine all contents of all files in a directory. Useful for directories filled with config settings, like /sys /proc /etc.
```sh
cd /proc/sys/net/ipv4
grep . *
```
- Summing all numbers in the third column of a text file (this is probably 3X faster and 3X less code than equivalent Python): - Summing all numbers in the third column of a text file (this is probably 3X faster and 3X less code than equivalent Python):
```sh ```sh
awk '{ x += $3 } END { print x }' myfile awk '{ x += $3 } END { print x }' myfile