#+options: toc:nil num:nil author:nil

* Searching

** Search for files

'find' can be used with multiple arguments such as:

 * -name: search for name
 * -iname: search for case-insensitive name
 * -type: type of file
   * f = file
   * d = directory

Search within all the directory and subdirectories by name

#+begin_src bash
find ./ -name "gitea*"
#+end_src

#+RESULTS:
./imagens/gitea-sm.png

Search for all the files ending in '.png'

#+begin_src bash
find ./ -name "*.png"
#+end_src

#+RESULTS:
./imagens/gitea-sm.png
./files/plot.png

Search for empty files in 'home'

#+begin_src bash
find /home -type f -empty
#+end_src

'find' can also be used with grep to match patterns:

#+begin_src bash
cd ~/Documentos/dat/intro_r/answers
find . | grep -E '.js|.png'
#+end_src

#+RESULTS:
| ./plot.png                                        |
| ./vizjs.js                                        |
| ./Rplot.png                                       |
| ./bipartiteD3Script.js                            |
| ./demo1.js                                        |

To find file with different name patters, 'find' can also be used as follows:

#+begin_src bash
 find . -type f \( -name "*.org" -o -name "*.md" \)
#+end_src

#+RESULTS:
| ./README.org        |
| ./bash_tutorial.org |

** Matching patterns

Print lines within files that match patterns

: grep

Example: searching for all entries that have "root"

#+begin_src bash
grep 'root' /etc/passwd
#+end_src

#+RESULTS:
: root:x:0:0::/root:/bin/bash

Additional arguments can be used with ~grep~:
 * r: recursive search (within directories)
 * n: print line number
 * i: case-insensitive  search
 * '*' Wildcards to search in all the directories

Search within files in the actual directory with wildcards

#+begin_src bash
grep -rni IFELSE *
#+end_src

#+RESULTS:
|answers/repl_values.R:137:    mutate(Status = ifelse(Status == "almost peak" &|
|answers/categ_colum.R:40:df$lead_likely <- ifelse(grepl("UNCOVERED CURB | SERVICE", df$remarks),  "non-lead", "unknown")|
|docs/vectorization.org:354:(counting number of repeated value), and =ifelse= (vectorized if...else|

'grep' can be used also to search for files in directories as shown in the anterior
example using grep with extended regular expressions ("-E") and 'find'

: find . | grep -E '.js|.png'

In this example, 'find' will be passed to 'grep' and any pattern matching
will be printed