Linux Tutorials: grep command & example

Find text in a file/files. The grep command searches through many files at a time to find a piece of text you are looking for.

grep PATTERN [FILE]

$ grep failed transaction.log

The above command will find all of the words in the files that matched the word ‘failed’.

grep command reference and example

• https://www.devopsschool.com/commands/tools/linux/grep
• https://www.devopsschool.com/blog/unix-command-grep/

   28  man grep
   29  clear
   30  ls
   31  more yum.log
   32  more dmesg.old
   33  clear
   34  grep BIOS dmesg.old
   35  clear
   36  ls
   37  grep -R error .
   38  clear
   39  grep -R -i error .
   40  clear
   41  grep -R -i error .
   42  grep -R -i error . | grep -v BERT
   49  grep error dmesg
   50  grep error dmesg dmesg.old
   51  grep error dmesg dmesg.old messages
   52  grep -R -i error .
   54  grep error dmesg
   55  grep -i error dmesg
   56  cd
   57  ls
   58  ls /var/log/ | grep -i error
   59  ls /var/log/ | grep *.log
   60  ls /var/log/ | grep .log
   61  ls /var/log/ | grep .log | grep -v yum
   62  cd /var/log/
   63  ls
   64  clear
   65  grep -o error dmesg
   66  grep -o Error dmesg
   67  grep Error dmesg
   68  grep -n Error dmesg
   69  grep -c error .
   70  grep -c error
   71  grep -c error *
   72  grep -c -i error *

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