Linux File System and The Shell Yonglei Tao

Linux File System  Consists of one or more self-contained file management units  each is known as a filesystem  A file is a collection of related information  including anything from which data can be taken or to which data can be sent

Basic Commands  file fname  ls dir  ls –F  ls –a  cd ~  cd..  Variable PATH  mv f1 f2 … dir  mv oldf newf  rm f1 f2 …  rmdir d1 d2  mkdir name  cp f1 d1  cp f1 f2

Access Permission  User types: owner, group, and other  Access rights: r, w, and x  ls –l  chmod a+rw letter.txt  chmod o-wx report.ps  umask  umask 022

Record Your Session  script ……  exit  script mySession ……  exit

Command Line Syntax  gcc –o proj proj.c  ls  ls –r  ls –x  ls –rx  ls -xr  ls –r -x  ls -- help

Display Message  echo “a message”  echo –e “enter filename: \c”  echo $PATH  printf “My Shell is %s\n” $SHELL

Standard Input/Output and Redirection  cat filename  cat file1 file2 file3 > largefile  cat  cat < largefile  cat > newfile.txt  cat file1 file2 >> file3  date > whoson  who >> whoson  cat whoson

Pipes and Filters  who | sort  grep date date.c  cat date.c | grep date  grep date temp  who | sort | wc  who | sort | tee who.out | wc -l

Filename Expansion (Wildcards)  ls proj?.c  echo proj*  ls *.txt  echo [aeiou]*  echo [x-z]*  ls part[a-d][0-4]