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A pipe is the communication channel between two commands.
% cat /etc/passwd root:R5/nLbJ3VF78s:0:1:Operator:/:/bin/csh bischof:cpEXB4L5d5qwg:106:11:Hans-Peter Bischof:/home/bischof:/bin/sh tymann:AFDcMs32dgrEQ:103:11:Paul Tymann:/home/tymann:/bin/sh backup:kmyEWtLi1VflI:120:11:Backup:/home/backup:/bin/sh % cat file | cut -f5 -d: | sort Backup Hans-Peter Bischof Operator Paul Tymann
One example:
1 #!/bin/sh
2
3 MINIMUM=3144
4 rm --f Single/*.ps
5
6 PWD=`pwd`
7
8 DIR=`echo $PWD | cut --d/ --f4`
9 case $DIR
10 in 221) echo "Foundations of CS"
11 TARGET=$HOME/public_html/$DIR
12 ;; 214) echo "Fortran Course"
13 TARGET=$HOME/public_html/$DIR
14 ;; *) echo "$PWD!"
15 exit 1
16 esac
17
18 rm --f $TARGET/*.ps
19
20 i=0
21 while :
22 do
23 i=`expr $i + 1 `
24 if [ $i --lt 10 ]
25 then
26 name="00$i"
27 else
28 if [ $i --lt 100 ]
29 then
30 name="0$i"
31 else
32 name=$i
33 fi
34 fi
35 echo "------ > " $name
36
37 cat header c.[01][0--9] | \
38 soelim | \
39 nsp --l4 --c14 2>/dev/null | \
40 gpic | \
41 tbl | \
42 geqn | \
43 groff --ms --n1 --o$i 2> /dev/null > Single/$name.ps
44
45 size=`ls --l Single/$name.ps | awk '{ print $5 } '`
46
47 if [ $size --lt $MINIMUM ]
48 then
49 rm Single/$name.ps
50 cp Single/*.ps $TARGET
51 break
52 fi
53 done
54 # ...
55
56 exit 0
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Last modified 22/May/97