Useful Command Line Reference
Whenever I write a shell script I find myself trying to construct command line arguements to achieve what I want. Then I google the problem I’m going to solve and find better ways to do it. By the next time I need to solve a similar problem I forget what I’ve done… hence this post.
To list all files without extension:
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ls -R | grep -v “\.”
To sum the first column of values:
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awk ‘{tot=tot+$1} END {print tot}’
Today’s name abbreviated:
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date +%a
Send an email message:
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mail -s “subject line” blah@blah.com < /path/to/file
Traverse syslog directory, find all files with no extension, find out size
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#Get Kilobytes for Today’s files into <date>daily with full path
find -f /data/ | grep -v “\.” | grep -e [Wed]/[0-9][0-9]$ | \
xargs du -k > /home/staff/akonkol/scripts/$filename
- “find -f” will list the all the files/directorie’s full path
- “grep -v “\.” will find everything that is not a directory
- “grep -e” will find all paths that end with today’s abbreviation slash num num
- “xargs du -k” will perform a “du -k” on every path that is piped in.
