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Unix Bash Shell
Unix Bash Shell
35
Computer Science
Professional
10/25/2012
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Term
cat
 Definition
Concatenate files and print to console
Term
cmp file1 file2
 Definition
compare two files, byte by byte
Term
cut
 Definition
cuts a portion from each line of a file
cut -c2 filename gets the second character
cut -d "," -f2 uses , as delimiter, gets second field
Term
diff file1 file2
 Definition
compares two files, line by line
Term
echo hello
 Definition
writes "hello" to console
Term
grep filename
 Definition
searchs for strings or regular expressions in file
Term
head -10 filename
 Definition
gets the first ten lines of a file
Term
less
 Definition
lets you scroll backwards and forwards through a file
Term
more
 Definition
lets you scroll forwards and backwards through a file, the same as less
Term
sort filename
 Definition
sorts the file
Term
sort -t"," -k2 filename
 Definition
using , as a delimeter, sort the file by the second field
Term
tail -10 filename
 Definition
lists the last ten lines of the file
Term
tr "text" "other text"
 Definition
translate - swaps any instance of the first text for the second text in all text passed through it.
Term
tr [:lower:] [:upper:]
 Definition
traslates lower case to upper case all letters passed through it.
Term
tr -d [:digit:]
 Definition
deletes all nummbers passed through it
Term
wc -l filename
wc -c filename
wc -w filename
 Definition
counts lines, characters, or words in a file or input stream.
Term
cd
 Definition
change directory
Term
cd ..
 Definition
go to parent directory
Term
chmod
 Definition
change permissions on file
Term
chown
 Definition
change owner of file
Term
dirname
 Definition
returns the path of a file
Term
du
 Definition
lists directories and how many blocks of disk space they use.
Term
cp
 Definition
copies files or directories.
Term
find
 Definition
find files or directories.
Term
ln filename linkname
 Definition
creates a hard link to the file. The file names actually refer to the same physical data location, and remain when files are moved.
Term
ln -s filename linkname
 Definition
creates a soft link - a reference pointer to the file.
Term
ls
 Definition
lists all files in a directory.
Term
mkdir
 Definition
creates a directory.
Term
mv
 Definition
moves or renames a file.
Term
pwd
 Definition
prints working directory.
Term
rm
 Definition
deletes a file
Term
rmdir
 Definition
deletes a directory
Term
stat -c%i filename
 Definition
returns the node number of a file.
Term
touch
 Definition
creates an empty file
Term
tree
 Definition
displays the directories and files in a tree structure.
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