shell - Bash script does not output any data in tempfile -

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this code use, want collect data 4 logfile(s) in 1 file, sort , print temp filename.

#!/bin/bash  tempfile=$(mktemp) user=$1  # check input #if [ -z $1 ]; echo "give me 1 username or mail address please..."  # fill file user history cat /var/log/messages | grep $user >> $tempfile cat /var/log/maillog | grep $user >> $tempfile zcat /var/log/messages*gz | grep $user >> $tempfile zcat /var/log/maillog*gz | grep $user >> $tempfile  # sort date cat $tempfile | sort -k1m -k2n -k3n > $tempfile  echo $tempfile

cat , zcat everywhere useless , cannot redirect same file you're reading, 0 byte file.

try this:

#!/bin/bash  tempfile=$(mktemp) user="$1"  # check input #if [ -z $1 ]; echo "give me 1 username or mail address please..."  # fill file user history grep "$user" /var/log/messages >> $tempfile grep "$user" /var/log/maillog >> $tempfile zgrep "$user" /var/log/messages*gz >> $tempfile zgrep "$user" /var/log/maillog*gz >> $tempfile  # sort date sort -k1m -k2n -k3n "$tempfile" > "$tempfile.tmp" mv "$tempfile.tmp" "$tempfile"  cat "$tempfile"

ps: don't use upper case user variable run otherwise overwrite shell provide value variable. in general not recommended use uppercase variables in script.


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