diff --git a/README.md b/README.md index 85bb455..ebe622e 100644 --- a/README.md +++ b/README.md @@ -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. +- 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, ``` >>> 2+3 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 @@ -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. +- 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 @@ -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: `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