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32 Cards in this Set
- Front
- Back
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pwd
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show the present working directory or current directory
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cd
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Change Directory to your HOME directory
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cd /usr/strim100
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change current directory to /usr/strim100
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cd init
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change current directory to INIT which is a sub-directory of the current directory.
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cd . .
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Change current directory to the parent directory of the current directory
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cd $STRMWORK
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Change current directory to the diretory defined by the environment variable 'STRMWORK'.
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cd ~bob
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change the current directory to the user bob's home directory (if you have permission).
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ls
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list a directory
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ls -l
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list a directory in long (detailed) format
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ls -a
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list the current directory including hidden files. Hidden files start with "."
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ls -ld*
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list all the file and directory names in the current directory using long format. Without the "d" option, ls would list the contents of any sub-directory of the current. with the "d" option, ls just lists them like regular files.
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chmod 755 file
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changes the permission of file to be rwx for the owner, and rx for the group and the world. (7 = rwx = 111 binary. 5 = r-x = 101 binary)
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chgrp user file
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makes the file belong to the group user.
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chown cliff file
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makes cliff the owner of the file
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chown -R cliff dir
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makes cliff the owner of dir and everything in its directory tree.
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cp file 1 file 2
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copy a file
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mv file1 newname
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move or fename a file
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mv file1 ~/AAA/
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Move file1 into sub-directory AAA in your home directory
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rm file1 [file2 ...]
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remove or delete a file
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rm -r dir1 [dir2...]
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recursively remove a directory and its contents BE CAREFUL!
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mkdir dir1 [dir2...]
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create directories
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mkdir -p dirpath
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create the directory dirpath, including all implied directories in the path.
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rmdir dir1 [dir2...]
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remove an empty directory
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cat filename
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Dump a file to the screen in ascii.
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more filename
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progressively dump a file to the screen: ENTER = one line down SPACEBAR = page down q=quit
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less filename
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Like more, but you can use Page-Up too. not on all systems
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vi filename
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edit a file using the vi editor. all unix systems will have vi in some form.
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emacs filename
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edit a file using the emacs editor. not all systems will have emacs.
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head filename
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show the first few lines of a file.
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head -n filename
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show the first n lines of a file.
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tail filename
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show the last few lines of a file.
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tail -n filename
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show the last n lines of a file.
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