{"id":1649,"date":"2024-03-02T00:00:00","date_gmt":"2024-03-02T05:00:00","guid":{"rendered":"https:\/\/molecularsciences.org\/content\/?p=1649"},"modified":"2024-03-10T00:00:53","modified_gmt":"2024-03-10T05:00:53","slug":"chmod-cheat-sheet","status":"publish","type":"post","link":"https:\/\/molecularsciences.org\/content\/chmod-cheat-sheet\/","title":{"rendered":"chmod Cheat Sheet"},"content":{"rendered":"\n

The chmod<\/code> command in Unix-like operating systems is used to change the permissions of a file or directory. This cheat sheet covers essential chmod<\/code> commands for managing file and directory permissions.<\/p>\n\n\n\n

Introduction:<\/strong><\/h4>\n\n\n\n

chmod<\/code> is a command-line utility that allows users to change the permissions of files and directories on Unix-based systems. It uses a symbolic or octal notation to specify permission settings.<\/p>\n\n\n\n

Basic Commands:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod [permissions] [file\/directory]<\/code><\/td>Change permissions using symbolic notation.<\/td><\/tr>
chmod [octal_permissions] [file\/directory]<\/code><\/td>Change permissions using octal notation.<\/td><\/tr>
chmod +[permission] [file\/directory]<\/code><\/td>Add a specific permission.<\/td><\/tr>
chmod -[permission] [file\/directory]<\/code><\/td>Remove a specific permission.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Symbolic Notation:<\/strong><\/h4>\n\n\n\n
Symbol<\/th>Permission<\/th><\/tr><\/thead>
u<\/code><\/td>User\/Owner<\/td><\/tr>
g<\/code><\/td>Group<\/td><\/tr>
o<\/code><\/td>Others<\/td><\/tr>
a<\/code><\/td>All (u+g+o)<\/td><\/tr>
r<\/code><\/td>Read<\/td><\/tr>
w<\/code><\/td>Write<\/td><\/tr>
x<\/code><\/td>Execute<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Examples – Symbolic Notation:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod u+r file.txt<\/code><\/td>Add read permission for the owner.<\/td><\/tr>
chmod go-w directory\/<\/code><\/td>Remove write permission for group and others.<\/td><\/tr>
chmod a+x script.sh<\/code><\/td>Add execute permission for all users.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Octal Notation:<\/strong><\/h4>\n\n\n\n
Octal<\/th>Permission<\/th><\/tr><\/thead>
4<\/code><\/td>Read<\/td><\/tr>
2<\/code><\/td>Write<\/td><\/tr>
1<\/code><\/td>Execute<\/td><\/tr>
0<\/code><\/td>No Permission<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Examples – Octal Notation:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod 644 file.txt<\/code><\/td>Give read and write permission to the owner and read-only permission to others.<\/td><\/tr>
chmod 755 script.sh<\/code><\/td>Give read, write, and execute permission to the owner, and read\/execute permission to group and others.<\/td><\/tr>
chmod 600 sensitive_file.txt<\/code><\/td>Restrict permissions to read and write only for the owner.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Recursive Changes:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod -R [permissions] [directory]<\/code><\/td>Recursively change permissions for a directory and its contents.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Special Permissions:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod +s executable<\/code><\/td>Set the setuid\/setgid bit.<\/td><\/tr>
chmod +t directory<\/code><\/td>Set the sticky bit.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Miscellaneous:<\/strong><\/h4>\n\n\n\n
Command<\/th>Description<\/th><\/tr><\/thead>
chmod --reference=[reference_file] [file\/directory]<\/code><\/td>Copy permissions from a reference file.<\/td><\/tr>
chmod --version<\/code><\/td>Display the chmod<\/code> version information.<\/td><\/tr>
chmod --help<\/code><\/td>Display help and usage information for chmod<\/code>.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Conclusion<\/h3>\n\n\n\n

The chmod<\/code> command is a powerful tool for managing file and directory permissions on Unix-based systems. This cheat sheet provides essential commands using both symbolic and octal notation, covering basic permissions, recursive changes, special permissions, and more. Whether you are a regular user or a system administrator, understanding these chmod<\/code> commands will help you control access to files and directories effectively.<\/p>\n","protected":false},"excerpt":{"rendered":"

The chmod command in Unix-like operating systems is used to change the permissions of a file or directory. This cheat sheet covers essential chmod commands for managing file and directory permissions. Introduction: chmod is a command-line utility that allows users to change the permissions of files and directories on Unix-based systems. It uses a symbolic […]<\/p>\n","protected":false},"author":1,"featured_media":1808,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,265],"tags":[35],"class_list":["post-1649","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-reference","tag-linux"],"_links":{"self":[{"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/posts\/1649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/comments?post=1649"}],"version-history":[{"count":1,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/posts\/1649\/revisions"}],"predecessor-version":[{"id":1650,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/posts\/1649\/revisions\/1650"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/media\/1808"}],"wp:attachment":[{"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/media?parent=1649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/categories?post=1649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/molecularsciences.org\/content\/wp-json\/wp\/v2\/tags?post=1649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}