Some Useful Linux-commands

Here is some useful linux commands

1. du -h file
   check the file size
2. pwd
   show the current directory location
3. locate file
   find the file name
4. alias name=”…”
   alias some commands
5. tar -xzvf file.tar.gz
   -x extract file, -v show extraction process, -f output to given file name, -z using gzip or unzip to extract gz format
6. cat /proc/cpuinfo
   display information of cpus
7. nvidia-smi -L
   list the gpus. need to install nvidia first
8. diff a b
   show difference between a and b files
9. chmod ugo file-name
   ugo is a oct number used to set the access mode of the file, indicating r (read), w (write), x (executive) mode of the file to different groups of users.
   For example if ugo = 666, then it means user, group and other groups can read, write the file, but can not execute the file.

permission to:  user(u)   group(g)   other(o)     
                /¯¯¯\      /¯¯¯\      /¯¯¯\
octal:            6          6          6
binary:         1 1 0      1 1 0      1 1 0
what to permit: r w x      r w x      r w x

binary         - 1: enabled, 0: disabled

what to permit - r: read, w: write, x: execute

permission to  - user: the owner that create the file/folder
                 group: the users from group that owner is member
                 other: all other users

Palmetto Commands: Need to be in login node (name node), not computing node or shell in jupyter Hub

1. checkquota: check my disk space quota
2. module avail : list available packages
3. qstat -xf jobid: check the status of job with id: jobid
4. qstat -Qf queuename : check status of a queue

References

[1] https://www.runoob.com/linux/linux-comm-tar.html