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Extracting character between 2 token - using only first match

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# 1  
Old 04-09-2014
Extracting character between 2 token - using only first match
Hello.

ps -ae return
Quote:
2638 ? 00:00:01 kworker/u8:0
2755 ? 00:00:00 pickup
3111 ? 00:00:00 kworker/u8:2
3127 ? 00:00:00 kwrite
3132 ? 00:00:00 kworker/0:2
3134 ? 00:00:00 kworker/2:2
3141 ? 00:00:00 kworker/0:0
3167 ? 00:00:00 kworker/2:0
3168 ? 00:00:00 kworker/u8:1
3214 ? 00:00:01 acroread
3334 pts/1 00:00:00 ps
I would like that the following command return 3214
Code:
echo " 3214 ?        00:00:01 acroread" | grep -o "[^[:space:]][[:digit:]][^[:space:]]*"

# 2  
Old 04-09-2014
Try grep with extended regex:
Code:
echo " 3214 ?        00:00:01 acroread" | grep -Eo "[[:space:]][[:digit:]]{4}[[:space:]]"
 3214

This User Gave Thanks to RudiC For This Post:
jcdole
# 3  
Old 04-09-2014
I'm not quite sure I understand. Are you trying to print the first column of the first entry whose third and fourth columns are 00:00:01 and acroread, respectively?

Edit: To add to RudiC's answer:
Code:
echo " 3214 ?        00:00:01 acroread" | grep -Eo "[[:space:]][[:digit:]]{4}[[:space:]]" | tr -d ' '

# 4  
Old 04-09-2014
If you are interested in awk, you may try this one

Code:
$ echo " 3214 ?        00:00:01 acroread" | awk --re-interval '{match($0,/^[[:space:]][[:digit:]]{4}[[:space:]]/,m);print m[0]}'
 3214

This User Gave Thanks to Akshay Hegde For This Post:
jcdole
# 5  
Old 04-09-2014
Quote:
Originally Posted by blakeoft
I'm not quite sure I understand. Are you trying to print the first column of the first entry whose third and fourth columns are 00:00:01 and acroread, respectively?

Edit: To add to RudiC's answer:
Code:
echo " 3214 ?        00:00:01 acroread" | grep -Eo "[[:space:]][[:digit:]]{4}[[:space:]]" | tr -d ' '

I want to extract >3214< from > 3214 ? 00:00:01 acroread<

---------- Post updated at 17:58 ---------- Previous update was at 17:50 ----------

And this work also :

Code:
echo " 3214 ?        00:00:01 acroread" | sed 's:^ \(.*\) ?.*$:\1:'

Thank you every body for helping.
# 6  
Old 04-09-2014
Longhand using __builtins__, OSX 10.7.5, default bash terminal...
Code:
#!/bin/bash
# 3214.sh
ifs_str="$IFS"
IFS="
"
echo "2638 ? 00:00:01 kworker/u8:0
2755 ? 00:00:00 pickup
3111 ? 00:00:00 kworker/u8:2
3127 ? 00:00:00 kwrite
3132 ? 00:00:00 kworker/0:2
3134 ? 00:00:00 kworker/2:2
3141 ? 00:00:00 kworker/0:0
3167 ? 00:00:00 kworker/2:0
3168 ? 00:00:00 kworker/u8:1
3214 ? 00:00:01 acroread
3334 pts/1 00:00:00 ps " > /tmp/3214.txt
line_number=1
while read line
do
	if [ "${line:0:4}" == "3214" ]
	then
		printf "3214" > /tmp/3214.text
		printf "\nLine number=$line_number...\n\n"
	fi
	line_number=$(( $line_number + 1 ))
done < /tmp/3214.txt
cat < /tmp/3214.text
IFS="$ifs_str"
exit 0

Results:-
Code:
Last login: Wed Apr  9 18:22:18 on ttys000
AMIGA:barrywalker~> chmod 755 3214.sh
AMIGA:barrywalker~> ./3214.sh

Line number=10...

3214AMIGA:barrywalker~> _

Also the line number it is on as a bonus too... ;o)
Note: The "3214" without a newline...

(Rigged for silent running for a while.)
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