How can I use a bash script to find the line number where a string occurs?
如何使用bash脚本查找字符串出现的行号？
For example if a file looked like this,
例如，如果文件看起来像这样，
Hello I am Isaiah
This is a line of text.
This is another line of text.
and I ran the script to look for the string "line" it would output the number 2, as it is the first occurance.
我运行脚本来查找字符串“line”，它将输出数字2，因为它是第一次出现。
2 个解决方案
#1
31
Given that your example only prints the line number of the first occurrence of the string, perhaps you are looking for:
鉴于您的示例仅打印第一次出现的字符串的行号，您可能正在寻找：
awk '/line/{ print NR; exit }' input-file
If you actually want all occurrences (eg, if the desired output of your example is actually "2\n3\n"), omit the exit.
如果您确实想要所有出现（例如，如果您的示例的所需输出实际上是“2 \ n3 \ n”），请省略退出。
#2
1
I like Siddhartha's comment on the OP. Why he didn't post it as an answer escapes me.
我喜欢Siddhartha对OP的评论。为什么他没有发布它作为答案逃脱了我。
I usually just want the line number of the first line that shows what I'm looking for.
我通常只想要显示我正在寻找的第一行的行号。
lineNum="$(grep -n "needle" haystack.txt | head -n 1 | cut -d: -f1)"
Explained: after the grep, grab just the first line (num:line), cut by the colon delimiter and grab the first field
解释：在grep之后，抓住第一行（num：line），用冒号分隔符剪切并抓住第一个字段
#1
31
Given that your example only prints the line number of the first occurrence of the string, perhaps you are looking for:
鉴于您的示例仅打印第一次出现的字符串的行号，您可能正在寻找：
awk '/line/{ print NR; exit }' input-file
If you actually want all occurrences (eg, if the desired output of your example is actually "2\n3\n"), omit the exit.
如果您确实想要所有出现（例如，如果您的示例的所需输出实际上是“2 \ n3 \ n”），请省略退出。
#2
1
I like Siddhartha's comment on the OP. Why he didn't post it as an answer escapes me.
我喜欢Siddhartha对OP的评论。为什么他没有发布它作为答案逃脱了我。
I usually just want the line number of the first line that shows what I'm looking for.
我通常只想要显示我正在寻找的第一行的行号。
lineNum="$(grep -n "needle" haystack.txt | head -n 1 | cut -d: -f1)"
Explained: after the grep, grab just the first line (num:line), cut by the colon delimiter and grab the first field
解释：在grep之后，抓住第一行（num：line），用冒号分隔符剪切并抓住第一个字段