gaspersic/the-art-of-command-line
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Rework ordering on #375 additions.

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Joshua Levy
2016-02-16 22:37:38 -08:00
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@ -184,20 +184,14 @@ Notes:
- For running a command with privileges, use `sudo` (for root) or `sudo -u` (for another user). Use `su` or `sudo bash` to actually run a shell as that user. Use `su -` to simulate a fresh login as root or another user. - For running a command with privileges, use `sudo` (for root) or `sudo -u` (for another user). Use `su` or `sudo bash` to actually run a shell as that user. Use `su -` to simulate a fresh login as root or another user.
- 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 `python` interpreter. For example,
``` ```
>>> 2+3 >>> 2+3
5 5
``` ```
- File attributes are settable via `chattr` and offer a lower-level alternative to file permissions. For example, to protect against accidental file deletion the immutable flag: `sudo chattr +i /critical/directory/or/file`
- Use `getfacl` and `setfacl` to save and restore file permissions. For example:
```sh
getfacl -R /some/path > permissions.txt
setfacl --restore=permissions.txt
```
## Processing files and data ## Processing files and data
@ -279,6 +273,13 @@ Also use `rsync` instead of `scp`, so that after network interruption you resume
- Use `zless`, `zmore`, `zcat`, and `zgrep` to operate on compressed files. - Use `zless`, `zmore`, `zcat`, and `zgrep` to operate on compressed files.
- File attributes are settable via `chattr` and offer a lower-level alternative to file permissions. For example, to protect against accidental file deletion the immutable flag: `sudo chattr +i /critical/directory/or/file`
- Use `getfacl` and `setfacl` to save and restore file permissions. For example:
```sh
getfacl -R /some/path > permissions.txt
setfacl --restore=permissions.txt
```
## System debugging ## System debugging
@ -323,7 +324,6 @@ Also use `rsync` instead of `scp`, so that after network interruption you resume
- If you delete a file and it doesn't free up expected disk space as reported by `du`, check whether the file is in use by a process: - If you delete a file and it doesn't free up expected disk space as reported by `du`, check whether the file is in use by a process:
`lsof | grep deleted | grep "filename-of-my-big-file"` `lsof | grep deleted | grep "filename-of-my-big-file"`
- 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.)
## One-liners ## One-liners