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http://steve-parker.org/sh/sh.shtml
v1.1 – 7 Aug 2007
UNIX / Linux Shell Cheat Sheet
File Manipulation
Test Operators
Variable Substitution
> file
create (overwrite) file
if [ “$x” -lt “$y” ]; then
${V:-def}
$V, or “def” if unset
>> file >file 2>&1
append to file both output and errors to file
fi
${V:=def} ${V:?err}
$V (set to “def” if unset) $V, or “err” if unset
< file a|b
read from file pipe output from 'a' as input to 'b'
Numeric Tests
Conditional Execution
lt gt
less than greater than
c1 || c2 c1 && c2
read text
eq ne
equal to not equal
Common utilities and switches
echo “Line is $f” done < file
file line by line
ge le
greater or equal less or equal
$ grep foo myfile afoo
find
Common Constructs while read f do
# do something
run c1; if it fails, run c2 run c1; if it works, run c2
ls -lSr ls -ltr ls -lh
list files, biggest last list files, newest last human-readable filesizes
File Tests nt newer than
du -sk * sort -n
directory sizes (slow) sort numerically (not alpha)
foo foobar
matching lines
d f
is a directory is a file
ps -ef wget URL
list my commands download URL
$ cut -d: -f5 /etc/passwd
get field
r w
readable writeable
time cmd touch file
stopwatch on `cmd` create file
with delimiter
x
executable
read x cmd | \
read “x” from keyboard cmd output to stdout and
String Tests = equal to
tee file.txt nice cmd
also to file.txt run cmd with low priority
z n
Networking
Dilbert foo=`ls`
get output of command
case $foo in
zero length not zero length
a) echo “foo is A”
case is a good way to avoid
Logical Tests
ifconfig -a netstat -r
list all network interfaces show routers
;; b) echo “foo is B”
iterating through many if/elif/elif/elif
&& || !
ssh u@host scp file.txt \ u@host:
log in to host as user “u” copy file.txt to host as user “u”
;; *)
logical AND logical OR logical NOT
constructs.
echo “foo is not A or B” ;; esac
Argument Variables
General Admin
$0 $1
program name 1st argument
less file alias l='ls -l'
display file, page by page create “l” as alias for “ls -l”
$2 ...
2nd argument ...
tar cf t.tar \ list_of_files
create a tar archive t.tar from the listed dirs/files
doubleit() { expr $1 \* 2
function declaration
$9 $*
9th argument all arguments
cal 3 1973 df -h
display a calendar (Mar 73) show disk mounts
} doubleit 3
and calling syntax
$#
No. of arguments
truss -p PID
show syscalls of PID
# returns 6
Files: Contents / Attributes A for loop for i in * do
iterates through its input (which
echo “File is $i” done
is subject to globbing)
find . -size 10k -print
files over 10Kb
find . -name “*.txt” -print find /foo -type d -ls
find text files ls all directories
three=`expr 1 + 2`
under /foo simple maths
echo "scale = 5 ; 5121 / 1024” | bc egrep “(foo|bar)” file
better maths find “foo” or “bar” in file
Useful Variables $IFS $?
Internal File Separator return code from last program
awk '{ print $5 }' file
print the 5th word of each line
$SHELL LANG
what shell is running this script? Language; C is US English
sed s/foo/bar/g file
replace “foo” in file with “bar”
A full PDF and online tutorial is available at http://steve-parker.org/sh/sh.shtml
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