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- Added bash _quick substitution_
- Added some improvements to the bullet on `sudo`
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2016-08-22 16:50:22 -05:00
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@ -101,6 +101,11 @@ Notes:
cat hosts | xargs -I{} ssh root@{} hostname cat hosts | xargs -I{} ssh root@{} hostname
``` ```
- To rerun the previous command with some pattern replaced: `^old^new`. For example:
```bash
echo foo
^foo^bar # equivalent to: echo bar
```
- `pstree -p` is a helpful display of the process tree. - `pstree -p` is a helpful display of the process tree.
@ -185,7 +190,7 @@ Notes:
- For a simple web server for all files in the current directory (and subdirs), available to anyone on your network, use: - For a simple web server for all files in the current directory (and subdirs), available to anyone on your network, use:
`python -m SimpleHTTPServer 7777` (for port 7777 and Python 2) and `python -m http.server 7777` (for port 7777 and Python 3). `python -m SimpleHTTPServer 7777` (for port 7777 and Python 2) and `python -m http.server 7777` (for port 7777 and Python 3).
- 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 `sudo bash` to actually run a shell as that user. Use `su` to login as another user and `sudo -i` to login as root. 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.) - 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.)