Unix Shell Programming Third Edition phần 1 doc
Unix Shell Programming Third Edition phần 1 doc
... 4
-rwxr-xr-x 1 pat DP3822 13 58 Jan 15 11 : 01 lcat
-rwxr-xr-x 1 pat DP3822 504 Apr 21 18:30 xtr
$ ln -s /users/steve/wb ./symwb Symbolic link to wb
$ ls -l
total 5
-rwxr-xr-x 1 pat DP3822 13 58 Jan 15 11 : 01 ... pat DP3822 13 58 Jan 15 11 : 01 lcat
-rwxr-xr-x 1 pat DP3822 504 Apr 21 18:30 xtr
$ ln /users/steve/wb . link wb to pat's bin
$ ls -l
total 5
-rwxr-xr-x...
Unix Shell Programming Third Edition phần 3 docx
... text > text.out
sed 's/\([Uu]nix\)/ \1( TM)/g' text > text.out
date | cut -c12 -16
date | cut -c5 -11 ,25- | sed 's/\([0-9]\ {1, 2\}\)/ \1, /'
3:
Write the commands to
a.
So you ... variables, as shown in the next example:
$ value1 =10
$ value2=value1
$ echo $value2
value1 Didn't do that right
$ value2=$value1
$ echo $value2
10 That's better
$
Remember t...
Unix Shell Programming Third Edition phần 8 doc
... are
preceded by 0x:
$ typeset -i i= 010 0
$ echo $i
64
$ i=0x80
$ echo $i
12 8
$ i=2 #11 010 01
$ echo $i
10 5
$ (( i = 16 #a5 + 16 #12 0 ))
$ echo $i
453
$
Unlike the Korn shell, Bash doesn't keep track ... Enter.
Table 15 .1 summarizes the basic vi line edit commands.
Table 15 .1. Basic vi Line Edit Commands
shell, and also contains many extensions from the Korn and C shells....
Unix Shell Programming Third Edition phần 2 pot
... occurrences of " ;Unix& quot; in the text to " ;UNIX. " This can be easily
done in sed as follows:
$ sed 's /Unix/ UNIX/' intro Substitute Unix with UNIX
The UNIX operating system ... phonebook
Alice Chebba\t973-555-2 015
Barbara Swingle\t2 01- 555-9257
Jeff Goldberg\t2 01- 555-3378
Liz Stachiw\t 212 -555-2298
Susan Goldberg\t2 01- 555-7776
Tony Iannino\t973-555...
Unix Shell Programming Third Edition phần 4 pptx
... positions 12 through 19 .
Actually, for this program, you really only need the hour displayed in positions 12 and 13 . So to get
the hour from date, you can write
$ date | cut -c12 -13
10
$
Now the ... 973-555-2 015
Barbara Swingle 2 01- 555-9257
Billy Bach 2 01- 555-7 618
Liz Stachiw 212 -555-2298
to achieve the same result. The double quotes are needed around the sed command to ensu...
Unix Shell Programming Third Edition phần 5 pptx
... memo [1- 4]
> do
> run $file
> done & Send it to the background
[1] 9932
$
request id is laser1-85 (standard input)
request id is laser1-87 (standard input)
request id is laser1-88 ... done
request id is laser1-33 (standard input)
request id is laser1-34 (standard input)
request id is laser1-35 (standard input)
request id is laser1-36 (standard input)
$
The four words memo1, mem...
Unix Shell Programming Third Edition phần 6 ppt
... short example:
$ cat foo1
echo :$x:
foo2
$ cat foo2
echo :$x:
$ foo1
::
:: x not known to foo1 or foo2
$ x =10 0 foo1 Try it this way
:10 0: x is known to foo1
:10 0: and to its subshells
$ echo :$x:
:: ... " %12 d %12 d\n" $number1 $number2
done
$ cat data
12 34 7960
593 -595
395 304
3234 999
-394 -493
$ align data
12 34 7960
593 -595
395 304
3234 999
-394 -493
$
In Chapte...
Unix Shell Programming Third Edition phần 7 pdf
... Table 13 .1. A more complete list is given under the trap command in Appendix A,
" ;Shell Summary."
Table 13 .1. Commonly Used Signal Numbers
Signal
Generated for
0
Exit from the shell
1
Hangup
2
Interrupt ... path
#
mycd ()
{
if [ $# -le 1 ]
then
# normal case 0 or 1 argument
cd $1
elif [ $# -eq 2 ]
then
# special case substitute $2 for $1
cd $(echo $PWD | sed &qu...
Unix Shell Programming Third Edition phần 9 ppt
... last 16 commands
fc -e vi sed Read the last sed command into vi
fc 10 0 11 0 Read commands 10 0 to 11 0 into $FCEDIT
fc -s Re-execute the previous command
fc -s abc=def 10 4 Re-execute command 10 4, ... read hours mins
10 19
$ echo "$hours:$mins"
10 :19
$ read num rest
39 East 12 th Street, New York City 10 003
$ echo "$num\n$rest"
39
East 12 th Street, New...
Unix Shell Programming Third Edition phần 10 pptx
... phonebook file example 2nd 3rd 4th 5th 6th 7th 8th 9th 10 th
shift command 2nd 3rd
rem 2nd 3rd 4th 5th 6th 7th 8th 9th 10 th 11 th 12 th 13 th
replacing current program with new program 2nd 3rd ...
Bash shell
beginning of line, matching 2nd
bg command 2nd 3rd 4th 5th 6th
books
AWK Programming Language, The
Learning Pearl
Programming Pearl
Unix C Shell Field Gui...