Linux chown -R & chmod 777 & chmod +x All In One

Linux chown -R & chmod 777 & chmod +x All In One

chown

https://linux.die.net/man/1/chown

1. chown - change file owner and group

https://linux.die.net/man/2/chown

2. chown, fchown, lchown - change ownership of a file ✅

https://www.geeksforgeeks.org/chown-command-in-linux-with-examples/

MongoDB

# start service
$ mongod

# start mongodb REPL instance
$ mongo

$ sudo mkdir -P /data/db
$ whoami
# xgqfrms-mbp

# sudo chown -R ur/username /data/db
$ sudo chown -R xgqfrms-mbp /data/db

# list services
$ brew services list

$ brew services start mongodb
$ brew services stop mongodb

https://www.youtube.com/watch?v=GTuJ1p7gpx4

chmod

1. chmod - change file mode bits

chmod [OPTION]... MODE[,MODE]... FILE...
chmod [OPTION]... OCTAL-MODE FILE...
chmod [OPTION]... --reference=RFILE FILE...

https://linux.die.net/man/1/chmod

2. chmod, fchmod - change permissions of a file ✅

#include <sys/stat.h>

int chmod(const char *path, mode_t mode);
int fchmod(int fd, mode_t mode);

https://linux.die.net/man/2/chmod

chmod +x / chmod 755

chmod +x === chmod 755

# chmod +x is equal to chmod ugo+x (Based on umask value)
# chmod 755 is equal to chmod u=rwx,go=rx

$ chmod +x
$ chmod 755
$ chmod u=rwx,go=rx

755

# rwx = 7
# r-x = 5
# r-x = 5

$ ls -alth
-rwxr-xr-x

chmod 777

777

# rwx = 7
# rwx  = 5
# rwx  = 5

$ ls -alth
-rwxrwxrwx

demos

#!/bin/sh

# echo "^-v-^ JSON DB is running in development env!" && npm run db

# echo "^-v-^ JSON DB is running in development env!" && nodemon -w ./server.js localhost 8888

JSONDB="nodemon -w ./server.js localhost 8888"

${JSONDB} &
# chmod +x db.sh
# sudo ./db.sh
# nodemon -w ./server.js localhost 8888

# /bin/sh db.sh

# ps -ef | grep node
# sudo kill -9 <PID>

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refs

https://zzk.cnblogs.com/my/s/blogpost-p?Keywords=chmod

https://www.cnblogs.com/xgqfrms/p/9546961.html

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