Shell

Shell Tricks

Easy changing directory
- cd - change to last directory
- pushd and pops:
  - pushed change directory and store the current directory on a stack
  - pops pop one directory from the stack and change to it
The environment variable SHLVL gives the level of shells I’m in

Getting all the href links from a URL

curl -s <url> | grep -o '<a *href *= *"[^"]*"' | cut -d '"' -s -f 2

ls sort by modification time:
```
ls -t
```

find

Find broken soft links:

find . -type l | (while read FN ; do test -e "$FN" || ls -ld "$FN"; done)

Find all hard links to some file:
```
find -x <path> -samefile <file name>
```
-x avoids searching in directories with different device number
Find files with modification in the future, use the -newer option
```
find . -type f -newer <some file>
```