Grep for beginning and end of line

Question

I have a file where I want to grep for lines that start with either -rwx or drwx AND end in any number    I ve got this  but it isnt quite right  Any ideas   grep    rwx   0-9  usrLog txt

User · Answer

Many answers provided for this question  Just wanted to add one more which uses bashism-      bin bash while read -r       -n   REPLY      do      REPLY       -rwx drwx      digit          amp  amp  echo  Got one - gt   REPLY  done  lt   1     kurumi answer for bash  which uses case is also correct but it will not read last line of file if there is no newline sequence at the end Just save the file without pressing  Enter Return  at the last line

User · Answer

It looks like you were on the right track    The   character matches beginning-of-line  and   matches end-of-line  Jonathan s pattern will work for you    just wanted to give you the explanation behind it

User · Answer

You probably want egrep   Try   egrep    d- rwx   0-9    usrLog txt

User · Answer

are you parsing output of ls -l   If you are  and you just want to get the file name  find   -iname    0-9      If you have no choice because usrLog txt is created by something someone else and you absolutely must use this file  other options include  awk     -d    0-9     file   Ruby 1 9    ruby -ne  print if    -d    0-9     file   Bash  while read -r line   do  case  line in  -d   0-9    echo  line   esac  done  lt  file

User · Answer

It should be noted that not only will the caret     behave differently within the brackets  it will have the opposite result of placing it outside of the brackets   Placing the caret where you have it will search for all strings NOT beginning with the content you placed within the brackets   You also would want to place a period before the asterisk in between your brackets as with grep  it also acts as a  wildcard    grep    rwx    0-9     This should work for you  I noticed that some posters used a character class in their expressions which is an effective method as well  but you were not using any in your original expression so I am trying to get one as close to yours as possible explaining every minor change along the way so that it is better understood   How can we learn otherwise

User · Answer

The tricky part is a regex that includes a dash as one of the valid characters in a character class   The dash has to come immediately after the start for a  normal  character class and immediately after the caret for a negated character class   If you need a close square bracket too  then you need the close square bracket followed by the dash   Mercifully  you only need dash  hence the notation chosen   grep    -d rwx   0-9           See  Regular Expressions and grep for POSIX-standard details

[grep] Grep for beginning and end of line?

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