# Print the name and size of all files in a directory
ls -l | awk '{print $9, $5}'
#Print the files that contain unix in their name
ls -l | awk '/unix/ {print $9, $5}'
#Print the name and owner of files with a size greater than 100,000 bytes
ls -l | awk '{if ($5 > 100000) print $9, $3}'
#Print lines 35 through 50 of a file named listofstuff
awk '/35/,/50/' listofstuff
#Print the lines in a file named file1 that begin with DEBUG
awk '/^DEBUG/
cat
cmp
cut
date
echo
expr
file
find
fmt
grep
head
join
paste
ps
sed
test
tr
uniq
which
#Catenate 2 files together
cat file1 file2 > file3
# Show where two files are different
cmp -l test test1
# The exit status is 0 is files are identical, 1 if different and > 1
# for an error. Use this to decide what to do.
#! /bin/bash
if cmp -s junk junk.s; then
echo "the same"
else
echo "different"
fi
echo "abc/def/ghi" | cut -d/ -f2 # prints def
# put columns 5-10 of a file into another file
cut -b 5-10 < file > columns5-10
date
echo "The value of count is " $COUNT
echo -n "The sum is "
echo $[$X + $Y]
# If COUNT is not zero, print the value, otherwise print a message
expr $COUNT \| "COUNT not set" # COUNT or if COUNT
# Return the larger of two values
function max (x, y)
{
if expr $x > $y then
return $x
else
return $y
fi
}
# Get a substring from a string starting at 8 and 10 characters long
# and output it
expr substr $NAME 8 10
# Determine the number of characters in a string variable
expr "$NAME" : ".*"
# or
expr length $NAME
# Determine, if possible, the types of files
file xyz
file $3
# Find text files and compress
if test `file -b $filename | cut -f1 -d ' '` = "ASCII"
then
compress $filename
fi
# find a file with a specific name
find /usr/local -name run.jar
# find files over 100 days since last access
find $DIR -atime +100
# find files owned by a particular user
find / -user $USER
# find all files with size greater than 1 megabyte and delete them
find ~ -size +1024b -exec rm \{\} \;
# Format file1 to have 20 volumns with standard spacing
# and output to file2
fmt -20 -u < file1 > file2
# Find all occurrences of the string "mp3" in files in /usr/users/$name
grep mp3 /usr/users/$name/*
# Get the filenames of files containing the string "mp3" or MP3 in files in
# /usr/users/$name
grep -l -i mp3 /usr/users/$name
# Get the filenames of all files that DON'T contain the string
# th?r*.bin (any case) in the current directory and all directories below.
grep -l -i -r "th?r*.bin *
#
# Print the first 10 lines of the specified file and look for the
# script command
head $1 | grep bash
# As before, but print only the first 20 bytes
head -c 20 $1 | grep "[sh bash csh]"
# Join two files that match join fields line for line.
join file1 file2
# Join and insert empty fields for missing data
join -e EMPTY file1 file2
# Join with the join field being field 2 in file1 and
# field 4 in file2
join -1 2 -2 4 file1 file2
# Create a new file consisting of lines from file1 and file2
paste file1 file2 > file3
# Paste three files together side-by-side using semicolons to
# separate the lines
paste -d; file1 file2 file3 > file4
# List at all processes
ps ax
# List at all processes from user jimbob
ps -u jimbob
# List all processes, listing % cpu time, % memory usage, user, command and pid
ps ax -o %cpu, %mem, user, cmd, pid
# The syntax is the same as the internal shell command
#
# Find out if a file exists and print an appropriate message
if test -f menu.html; then echo "yes"; else echo "no"; fi
# Convert [ in a file to {
tr '[' '{' < file1 > file2
# Exchange a and z and p and g in a file
tr "apzg" "zgap" < file1 > file2
# Remove extraneous carriage returns from a file
tr -d '\r' < file1 ? file2
# Remove duplicate lines
uniq < file1 > file2
# Do so ignoring case
uniq -i < file1 > file2
# Print the duplicated lines in a file
uniq -d < file1
# Get the full path of the netscape
NETSCAPEPATH=`which netscape`