UNIX for Dummies Questions & Answers

> cat file305
sadfsdf sdfosuidhfousdhof soduhf osdfu osudfhosudhfd
sdfgsdfg
asdfiojhsdf asdoludhflsdjfhskldjfhsdjdlfsjdhnlj h sdja
ouahsdjdafkljsa
oljhljh

> cat file305x
5
3

> tr " " "~" <file305 | cat -n | tr -d " " | egrep -v -f file305x | tr "~" " " | tr "\t" "~" | cut -d"~" -f2
sadfsdf sdfosuidhfousdhof soduhf osdfu osudfhosudhfd
sdfgsdfg
ouahsdjdafkljsa

#!/usr/bin/env sh

# @(#) s2       Demonstrate creation of sed script for single-pass, delete lines.

set -o nounset

## The shebang using "env" line is designed for portability. For
#  higher security, use:
#
#  #!/bin/sh -

## Use local command version for the commands in this demonstration.

echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version bash sed
echo

# Create the line number test file, can be in any order.

cat >numbers <<EOF
4
7
3
EOF

# Create the test data file.

cat >data1 <<EOF
one
two
three
four
five
six
seven
eight
nine
ten
EOF

# Create the sed script file with sed itself:

sed 's|$|d|' numbers >script

# Now efficiently run sed once instead of n times, display the
# data.

sed -f script data1

exit 0

% ./s2
(Versions displayed with local utility "version")
GNU bash 2.05b.0
GNU sed version 4.1.2

one
two
five
six
eight
nine
ten