Tenth Line
1
2
3
4
5
6
| i=0
while (( i++ < 10 ))
do
read line
done < file.txt
echo $line
|
1
| tail -n +10 file.txt | head -1
|
AWK
Predefined Variables
awk divides the input into records and fields.
- NR: total number of input records read so far from all data files. It starts at zero and is never automatically reset to zero
- FNR: number of records that have been read so far from input. It’s reset to zero every time a new file is started
- NF: number of fields in the current record
Tenth Line
1
| awk 'NR == 10 {print; exit}' file.txt
|
1
| awk 'FNR == 10 {print; exit}' file.txt
|
END rule is executed once only, after all the input is read. Cleanup actions.
Transpose File
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| awk '
{
for (i = 1; i <= NF; i++) {
if (NR == 1) {
s[i] = $i;
} else {
s[i] = s[i] " " $i;
}
}
}
END {
for (i = 1; s[i] != ""; i++) {
print s[i];
}
}' file.txt
|
Print
Word Frequency
1
| cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -r | awk '{ print $2, $1 }'
|