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Two more small adjustments to #375.

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Joshua Levy 2016-02-16 22:41:01 -08:00
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@ -186,7 +186,7 @@ Notes:
- Know about the [128K limit](https://wiki.debian.org/CommonErrorMessages/ArgumentListTooLong) on command lines. This "Argument list too long" error is common when wildcard matching large numbers of files. (When this happens alternatives like `find` and `xargs` may help.) - Know about the [128K limit](https://wiki.debian.org/CommonErrorMessages/ArgumentListTooLong) on command lines. This "Argument list too long" error is common when wildcard matching large numbers of files. (When this happens alternatives like `find` and `xargs` may help.)
- For a basic calculator (and of course access to Python in general), use `python` interpreter. For example, - For a basic calculator (and of course access to Python in general), use the `python` interpreter. For example,
``` ```
>>> 2+3 >>> 2+3
5 5
@ -242,11 +242,10 @@ Notes:
rename 's/\.bak$//' *.bak rename 's/\.bak$//' *.bak
``` ```
- As the man page says, `rsync` really is a fast and extraordinarily versatile file copying tool. It's known for synchronizing between machines but is equally useful locally. It also is among the [fastest ways](https://web.archive.org/web/20130929001850/http://linuxnote.net/jianingy/en/linux/a-fast-way-to-remove-huge-number-of-files.html) to delete large numbers of files: - As the man page says, `rsync` really is a fast and extraordinarily versatile file copying tool. It's known for synchronizing between machines but is equally useful locally. When security restrictions allow, using `rsync` instead of `scp` allows recovery of a transfer without restarting from scratch. It also is among the [fastest ways](https://web.archive.org/web/20130929001850/http://linuxnote.net/jianingy/en/linux/a-fast-way-to-remove-huge-number-of-files.html) to delete large numbers of files:
```sh ```sh
mkdir empty && rsync -r --delete empty/ some-dir && rmdir some-dir mkdir empty && rsync -r --delete empty/ some-dir && rmdir some-dir
``` ```
Also use `rsync` instead of `scp`, so that after network interruption you resume the file transfer rather than restarting from scratch.
- Use `shuf` to shuffle or select random lines from a file. - Use `shuf` to shuffle or select random lines from a file.