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#1
03-21-2004
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How to print content on the screen
I have the following questions regrading Unix commands.
1. Could you provide the commands how to print the content of .profile and .shrc files on the screen using more and piple command? or a better way? 2. How can i use the head and tail to display lines from 25 through 75... or a better solution? 3. How to search the /etc/password that begins with character with the character "a"? Thank you much in advance! -Ryan |
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#2
03-22-2004
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Re: How to print content on the screen
Quote:
cat filename | more Quote:
head -n 75 filename | tail -n 51 limitation: this assumes that the lines 25-75 do exist Quote:
awk '{ if( substr($0, 1, 1) == "a" ) print $0 }' /etc/password (requires sufficient authorization) I'm by no means an expert, there may be better ways in all cases. regards, ropers |
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#3
03-22-2004
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to add to the 25 through 75 line problem:
Code:
filelength=`wc -l "filename" | awk '{print $1}'`
if [ $filelength -gt 74 ]; then
linesshort=0
else
let "linesshort = 75 - $filelength"
fi
let "tailnumber = 51 - $linesshort"
cat -n "filename" | head -n 75 | tail -n $tailnumber
There very likely is a MUCH easier way of doing this, but I don't know it. |
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#4
03-22-2004
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A Perl script can be written to dump the file contents between two line numbers:
body.pl Code:
#!/usr/bin/perl -w
my ($file, $s, $e) = @ARGV;
$s > $e and ($s, $e) = ($e, $s);
my $ln = 0;
open FILE, "<$file";
while ($line = <FILE>) {
++$ln;
if ($ln >= $s && $ln <= $e) {
print $line;
}
}
close FILE;
# Print lines 25--75 ./body.pl somefile.txt 25 75 |
Linear Mode
