This post will go through 10 different Linux commands and their R alternatives. If you’re interested in learning more R functions for working with files like some of those below, also check out this post.

How to list all the files in a directory

R

list.files("/path/to/directory")


list.files("/path/to/do/directory", recursive = TRUE)


# search for files containing "something" in their name
list.files("/path/to/do/directory", pattern = "something")


# search for all CSV files
list.files("/path/to/do/directory", pattern = ".csv")

Linux

ls /path/to/directory


ls -R /path/to/directory


# search for files containing "something" in their name
ls /path/to/directory | grep "something"


# search for all CSV files
ls /path/to/directory | grep ".csv"

Getting the top records in a file / object

R

# let df be a data frame
head(df)

head(df, 10)

Linux

head -6 some_file.txt

head -10 some_file.txt

Getting the current directory

R

getwd()

Linux

pwd

Changing the directory

R

setwd("/path/to/new/directory")

Linux

cd /path/to/new/directory

How to count the number of files in a directory

R

length(list.files("/path/to/some/directory"))

Linux

ls -1 | wc -l

How to check file permissions

R

file.info("/path/to/directory/file.txt")

file.info returns additional information about a file besides file permissions, including size, created time, last modified time, and last access time. If you just want to get permissions of the file, just run this:

file.info("/path/to/directory/file.txt")$mode

The permissions are returned in octal; to translate what this octal result means into read / write etc. abilities, see this link.

Linux

ls -l /path/to/directory/file.txt

How to create a new directory

R

# create folder in current directory
dir.create("new_folder")

# create folder in different directory
dir.create("/path/to/new_directory")

Linux

# create folder in current directory
mkdir new_folder

# create folder in different directory
mkdir /path/to/new_directory

How to create a new file

R

# create a file in current directory
file.create("new_file.txt")

# create file in different directory
file.create("/path/to/directory/new_file.txt")

Linux

# create a file in current directory
touch new_file.txt

# create file in different directory
touch /path/to/directory/new_file.txt

How to count the number of lines, words, and characters in a file

Though it’s possible to get the number of lines, words, and characters in a file using base R, it’s simpler to do so with the hyperSpec package.

Just use install.packages to install if needed:

install.packages("hyperSpec")

Running the below line of code will print out a data frame with the number of characters, words, and lines in the input file. Similarly, the Linux wc command will print out the same information for a file.

R

library(hyperSpec)

wc("/path/to/directory/file.txt")

Linux

wc /path/to/directory/file.txt

How to copy a file

R

# copy file.txt to new_directory
file.copy("/path/to/directory/file.txt", "/path/to/new_directory")

Linux

# option 1
cp /path/to/directory/file.txt /path/to/new_directory

# option 2
cp /path/to/directory/file.txt /path/to/new_directory/file.txt

That’s it for this post. Happy coding! Please check out my other R posts here.

The post 10 R functions for Linux commands and vice-versa appeared first on Open Source Automation.