Sed and Find
Sed and Find are both tiny but wonderful tools.
1. Sed
Give sample using this file sample.txt .
content:
Line1 hello
Line2
Line3
Line4
sed -i means taking modification back to the file.
1.1. Find and Append
sed 'N;/Line2/a\Line2.1' sample.txt
Line1 hello
Line2
Line2.1
Line3
Line4
1.2. Append at the end
sed '$a\LastLine' sample.txt
Line1 hello
Line2
Line3
Line4
LastLine
1.3. Search and Delete
sed '/Line2/'d sample.txt
Line1 hello
Line3
Line4
1.4. Delete line
sed '3d' sample.txt
delete line 3
Line1 hello
Line2
Line4
1.5. Replace
sed 's/Line/line/g' sample.txt
line1 hello
line2
line3
line4
1.6. Insert
sed '2iLine2.1' sample.txt
Inserts at line 2 Line2.1 .
Line1 hello
Line2.1
Line2
Line3
Line4
2. Find
ls -al
total 1860416
dr-xr-x---. 5 root root 4096 Oct 10 20:33 .
dr-xr-xr-x. 18 root root 4096 Aug 2 07:48 ..
-rw-------. 1 root root 1549 Jul 21 2018 anaconda-ks.cfg
-rw-r--r--. 1 root root 69856 Aug 19 15:35 kkk.txt
-rw-r--r--. 1 root root 31 Oct 10 20:33 sample.txt
-rw-r--r--. 1 root root 1120 Sep 19 12:05 tda.sh
-rw-r--r--. 1 tcpdump tcpdump 18997 Sep 19 12:31 test5.pcap
-rw-r--r--. 1 tcpdump tcpdump 18222 Sep 19 12:33 test6.pcap
-rw-r--r--. 1 tcpdump tcpdump 969225 Sep 19 12:50 test7.pcap
-rw-r--r--. 1 tcpdump tcpdump 29300 Sep 19 12:55 test8.pcap
-rw-r--r--. 1 tcpdump tcpdump 21058 Sep 19 13:31 test9.pcap
-rw-r--r--. 1 root root 48 Aug 20 19:51 tst.sh
2.1. File
.
|-- nest
| |-- ss.txt
|-- sample.txt
find ./ -name ss.txt
./nest/ss.txt
find ./ -type f -size +1M
2.2. Content
grep -R "Line" ./
./nest/ss.txt:Line1 hello
./nest/ss.txt:Line2
./nest/ss.txt:Line3
./nest/ss.txt:Line4
./sample.txt:Line1 hello
./sample.txt:Line2
./sample.txt:Line3
./sample.txt:Line4
OR:
find ./ -type f -exec cat {} + | grep Line2
Line2
Line2
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