Number of lines in the shell string

1. query the row number of the string.

Grep-n "XXX" str.txt #-N print the prefix of the number of lines where the character "XXX" is located in the file "stringstr.txt"

Example:

Str.txt

Xxx
Yyy
Zzz
Xxx

Enter the SEARCH Command: grep-n "XXX" str.txt

The result is as follows:

1: XXX
4: XXX

The row number is 1, 4, and matches the string "XXX". The two are separated by colons ":".

2. Find the row number that the string matches for the first time.

Grep-n "XXX" str.txt | head-1

The result is as follows:

1: XXX

Similarly, search for the last matched row number.

Grep-n "XXX" str.txt | tail-1

The result is as follows:

4: XXX

Find the row number that the second string matches

Grep-n "XXX" str.txt | head-2 | tail-1 # extract the first two rows and then the last row

The result is as follows:

4: XXX

3. Extract the row number of the string.

Grep-n "XXX" str.txt | cut-d ":"-F 1

First query all the line numbers of the string "XXX", and then use the cut command to separate the ":" character to extract the first field, that is, the line number.

The result is as follows:

1
4

Extract the row number of the first match

Grep-n "XXX" str.txt | head-1 | cut-d ":"-F 1

The result is as follows:

1

4. Compare the variation of two string row numbers

Two files: str.txt and str2.txt

Str.txt

Xxx
Yyy
Zzz
Xxx

Str2.txt

Yyy
Xxx
WWW
Zzz

Compare row number scripts

Catline. Sh

#!/bin/bashrm -rf ret.txttotal=`wc -l $1 | awk '{print $1}'`echo "total = $total"num=1while read linedo    echo $line    ret=`grep -n $line $2 | head -1`        echo $ret    if [ -z $ret ]; then        num2=$total        echo "null num2 = $total"    else        num2=`echo $ret | cut -d ":" -f 1`        echo "num2 = $num2"    fi    echo $num    change=`expr $num2 - $num`    echo "$num2 - $num = $change"    num=`expr $num + 1`    echo "$line=$change" >> ret.txtdone < $1cat ret.txt

Run the script command:

./Catline. Sh str2.txt str.txt

The running result is as follows:

total = 4yyy2:yyynum2 = 212 - 1 = 1xxx1:xxxnum2 = 121 - 2 = -1wwwnull num2 = 434 - 3 = 1zzz3:zzznum2 = 343 - 4 = -1yyy=1xxx=-1www=1zzz=-1