Linux Text Processing
cat, head, cut, sort, uniq, and awk for daily data shaping.
- awk
- cut sort uniq
- head tail
- text processing
- csv cli
Linux Text Processing
cat, head, cut, sort, uniq, and awk for daily data shaping.
Commands
| Command | What it does | ||
|---|---|---|---|
cat -n file | Numbered full output | ||
head -n 20 and tail -n 20 | First and last lines | ||
cut -d: -f1 /etc/passwd | First colon field | ||
| `sort file | uniq -c | sort -nr` | Frequency table |
awk -F, print column 2 | Second CSV column |
Example
sort access.log | uniq -c | sort -nr | headFAQ
Huge file - should I cat it?
No: page with less, sample with head, tail, or shuf, or stream through awk without loading all.
CSV with quoted commas?
cut and awk break - use csvkit or Miller for real CSV parsing.
常見問題
Huge file - should I cat it?
No: page with less, sample with head, tail, or shuf, or stream through awk without loading all.
CSV with quoted commas?
cut and awk break - use csvkit or Miller for real CSV parsing.
Linux
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Navigate, create, move, and inspect files with core commands.
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Read ls output, chmod, chown, and sudo without breaking access.
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Find files by name, age, and size; search inside them fast.
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See what runs, what eats CPU, and how to stop it cleanly.