AWK variable input

Question

I've got the following bash code:

md5sum -c checksum.md5 2>&1 | grep FAILED | awk '{print $1}' | sed 's/:$// > /tmp/check.tmp
awk '{system("wget http://example.com/"$1"")}' /tmp/check.tmp

How can I use awk without a temp file?

Something like

files=`md5sum -c checksum.md5 2>&1 | grep FAILED | awk '{print $1}' | sed 's/:$//`
awk '{system("wget http://example.com/"$1"")}' $files

Post input and output, it can almost deinfintely all be done in awk. — 123
– 123, Commented Jul 1, 2015 at 8:05
Piping sed to awk does not work? However, the tasks done by grep and sed here could be most likely done by awk too. — Melebius
– Melebius, Commented Jul 1, 2015 at 8:06

hek2mgl · Accepted Answer · 2015-07-01 08:21:34Z

2

You can simplify the whole command to this:

md5sum -c checksum.md5 2>&1 |\
    awk -F'[:/]' '/FAILED/{system("wget http://example.com/"$(NF-1))}'

edited Jul 1, 2015 at 8:21

answered Jul 1, 2015 at 8:08

hek2mgl

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3 Comments

chs_voks Over a year ago

Thank you! That's great, but a bit difficult

123 Over a year ago

You are missing closing quotes.

hek2mgl Over a year ago

@User112638726 Thanks, added them. The solution would also work only as long as file names doesn't contain :,;,$,(),{}, spaces, tabs or newlines. I'm not really happpy with it already, but you see, it's already too difficult. ;)

lcd047 · Accepted Answer · 2015-07-01 08:53:55Z

2

wget has a switch -i that can come in handy:

md5sum -c checksum.md5 2>&1 | \
    sed -n '/FAILED$/ { s/: FAILED$//; s!^!http://example.com/!; p; }' | \
    wget -i

answered Jul 1, 2015 at 8:53

lcd047

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Comments

Arjun Mathew Dan · Accepted Answer · 2015-07-01 08:05:35Z

1

Like this:

awk '{system("wget http://example.com/"$1"")}' <<< $files

answered Jul 1, 2015 at 8:05

Arjun Mathew Dan

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