{"id":192116,"date":"2023-06-20T09:40:10","date_gmt":"2023-06-20T13:40:10","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=192116"},"modified":"2023-06-20T09:40:54","modified_gmt":"2023-06-20T13:40:54","slug":"10-r-functions-for-linux-commands-and-vice-versa","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/10-r-functions-for-linux-commands-and-vice-versa\/","title":{"rendered":"10 R Functions for Linux Commands and Vice-versa"},"content":{"rendered":"\n

This post will go through 10 different Linux commands and their R<\/a> alternatives. If you\u2019re interested in learning more R functions for working with files like some of those below, also check out this post<\/a>.<\/p>\n\n\n\n

How to list all the files in a directory<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
ls<\/td>list.files()<\/td>Lists all the files in a directory<\/td><\/tr>
ls -R<\/td>list.files(recursive = TRUE)<\/td>Recursively lists all the files in a directory and all sub-directories<\/td><\/tr>
ls | grep \u201csomething\u201d<\/td>list.files(pattern = \u201csomething\u201d)<\/td>Lists all the files in a directory containing the regex \u201csomething\u201d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

R<\/em><\/strong><\/p>\n\n\n\n

list.files(\"\/path\/to\/directory\")\n \n \nlist.files(\"\/path\/to\/do\/directory\", recursive = TRUE)\n \n \n# search for files containing \"something\" in their name\nlist.files(\"\/path\/to\/do\/directory\", pattern = \"something\")\n \n \n# search for all CSV files\nlist.files(\"\/path\/to\/do\/directory\", pattern = \".csv\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
ls \/path\/to\/directory\n \n \nls -R \/path\/to\/directory\n \n \n# search for files containing \"something\" in their name\nls \/path\/to\/directory | grep \"something\"\n \n \n# search for all CSV files\nls \/path\/to\/directory | grep \".csv\"<\/pre>\n\n\n\n
Getting the top records in a file \/ object<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
head<\/td>head()<\/td>Prints the top n records of a file (Linux) \/ data frame or other object (R)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
# let df be a data frame\nhead(df)\n \nhead(df, 10)<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
head -6 some_file.txt\n \nhead -10 some_file.txt<\/pre>\n\n\n\n
Getting the current directory<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
pwd<\/td>getwd()<\/td>Gets the current directory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
getwd()<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
pwd<\/pre>\n\n\n\n
Changing the directory<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
cd<\/td>setwd()<\/td>Change the current working directory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
setwd(\"\/path\/to\/new\/directory\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
cd \/path\/to\/new\/directory<\/pre>\n\n\n\n
How to count the number of files in a directory<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
ls -1 | wc -l<\/td>length(list.files(\u2026))<\/td>Counts the number of files in a directory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
length(list.files(\"\/path\/to\/some\/directory\"))<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
ls -1 | wc -l<\/pre>\n\n\n\n
How to check file permissions<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
ls -l<\/td>file.info()<\/td>Returns the file permissions (Linux) \/ additional info (R)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
file.info(\"\/path\/to\/directory\/file.txt\")<\/pre>\n\n\n\n
file.info<\/strong> 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:<\/p>\n\n\n\n
file.info(\"\/path\/to\/directory\/file.txt\")$mode<\/pre>\n\n\n\n
The permissions are returned in octal; to translate what this octal result means into read \/ write etc. abilities, see this link<\/a>.<\/p>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
ls -l \/path\/to\/directory\/file.txt<\/pre>\n\n\n\n
How to create a new directory<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
mkdir<\/td>dir.create()<\/td>Creates a new directory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
# create folder in current directory\ndir.create(\"new_folder\")\n \n# create folder in different directory\ndir.create(\"\/path\/to\/new_directory\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
# create folder in current directory\nmkdir new_folder\n \n# create folder in different directory\nmkdir \/path\/to\/new_directory<\/pre>\n\n\n\n
How to create a new file<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
touch<\/td>file.create()<\/td>Creates a new file<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
# create a file in current directory\nfile.create(\"new_file.txt\")\n \n# create file in different directory\nfile.create(\"\/path\/to\/directory\/new_file.txt\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
# create a file in current directory\ntouch new_file.txt\n \n# create file in different directory\ntouch \/path\/to\/directory\/new_file.txt<\/pre>\n\n\n\n
How to count the number of lines, words, and characters in a file<\/strong><\/h2>\n\n\n\n
Though it\u2019s possible to get the number of lines, words, and characters in a file using base R, it\u2019s simpler to do so with the hyperSpec<\/strong> package.<\/p>\n\n\n\n
Just use install.packages<\/strong> to install if needed:<\/p>\n\n\n\n
install.packages(\"hyperSpec\")<\/pre>\n\n\n\n
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<\/strong> command will print out the same information for a file.<\/p>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
wc<\/td>wc()<\/td>Lists the number of characters, words, and lines in a file<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
library(hyperSpec)\n \nwc(\"\/path\/to\/directory\/file.txt\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
wc \/path\/to\/directory\/file.txt<\/pre>\n\n\n\n
How to copy a file<\/strong><\/h2>\n\n\n\n
Linux<\/th>R<\/th>What does it do?<\/th><\/tr>
cp<\/td>file.copy()<\/td>Copy a file<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
R<\/em><\/strong><\/p>\n\n\n\n
# copy file.txt to new_directory\nfile.copy(\"\/path\/to\/directory\/file.txt\", \"\/path\/to\/new_directory\")<\/pre>\n\n\n\n
Linux<\/em><\/strong><\/p>\n\n\n\n
# option 1\ncp \/path\/to\/directory\/file.txt \/path\/to\/new_directory\n \n# option 2\ncp \/path\/to\/directory\/file.txt \/path\/to\/new_directory\/file.txt<\/pre>\n\n\n\n
Originally posted on TheAutomatic.net<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
This post will go through 10 different Linux commands and their\u00a0R\u00a0alternatives.<\/p>\n","protected":false},"author":388,"featured_media":186467,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,343,338,341,342],"tags":[806,5041,487],"contributors-categories":[13695],"class_list":{"0":"post-192116","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-programing-languages","9":"category-ibkr-quant-news","10":"category-quant-development","11":"category-r-development","12":"tag-data-science","13":"tag-linux","14":"tag-r","15":"contributors-categories-theautomatic-net"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"\n10 R Functions for Linux Commands and Vice-versa<\/title>\n<meta name=\"description\" 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