KwickClips Course Topics · 44 sec · free
Which one keeps old data?
Short answer. The double greater-than sign, which appends.
What does a pipe do?
Joins two commands.
Redirection and pipe
| Symbol | Does |
|---|---|
| > | overwrites |
| >> | appends |
| < | reads a file |
| bar key | joins commands |
Remember
| Use >> to keep old data |
| Pipe joins two commands |
You saved output, and old data vanished. Why? Four symbols. Greater than overwrites a file. Double greater than appends. Less than reads a file. A pipe joins two commands. Two tips. Use double greater than to keep data. Pipes join.
This clip is from the full lesson: I/O redirection and pipes — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: GSEB Std 11 Computer Studies
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