Useful Terminal Commands

useful-terminal.sh

# Recursively find all files named config and replace a string using sed. The -i flag requires a blank suffix '' to work on Mac.
find . -name config -type f -print | xargs sed -i '' 's/git@github.com:CollegePlus/git@github.com:collegeplus/g'

# Recursively find all files with a certain file extension and replace a string using perl.
find . -name "*.fileext" -print | xargs perl -i -p -e 's/STRINGTOFIND/STRINGTOREPLACE/g'

# Display filesystem of mounted volumes
df -T | awk '{print $1,$2,$NF}' | grep "^/dev"

# Recursively force files lowercase with rename
find . -depth -print -execdir rename -f 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;

# Recursively change spaces to underscores with rename
find . -depth -print -execdir rename -f 'y/ /_/' {} \;

# Trim log files to keep 100 last lines at bottom of file.
find / -name '*'.log | while read x; do sed -i -e :a -e '$q;N;100,$D;ba' $x; done