This question has been asked in another thread, and this is the best answer IMO: export LOG_FILE_PATH=/expanded/path/of/the/log/file/../logfile.log cat Text_File.msh | envsubst > Text_File_expanded.msh if on Mac, install gettext first: brew install gettext see: Forcing bash to expand variables in a string loaded from a file
Ksh93 (or bash) doesn’t have such expressions, so it’s better to make it explicit. But you can bundle multiple variables (with their initial values) in a single export phrase: export A=1 B=2 C=3 Testing: $ (export A=1 B=2 C=3 && ksh -c ‘echo A=$A B=$B C=$C D=$D’) A=1 B=2 C=3 D= Awkward alternatives There is … Read more
Curly brackets? for i in {1..7} do #stuff done
Instead of storing the output of grep in a variable and then checking whether the variable is empty, you can do this: if grep -q “poet” $file_name then echo “poet was found in $file_name” fi ============ Here are some commonly used tests: -d FILE FILE exists and is a directory -e FILE FILE exists -f … Read more
There are many ways: sed: replace $ (end of line) with the given text. $ sed ‘s/$/ | COUNTRY/’ file india | COUNTRY sudan | COUNTRY japan | COUNTRY france | COUNTRY awk: print the line plus the given text. $ awk ‘{print $0, “| COUNTRY”}’ file india | COUNTRY sudan | COUNTRY japan | … Read more
The find command supports -printf option which recognizes a lot of placeholders. One such placeholder is %d which renders the depth of given path, relative to where find started. Therefore you can use following simple one-liner: find -type d -printf ‘%d\t%P\n’ | sort -r -nk1 | cut -f2- It is quite straightforward, and does not … Read more
The easiest way to do this is to use the following command: unzip -Z -1 archive.zip or zipinfo -1 archive.zip This will list only the file names, one on each line. The two commands are exactly equivalent. The -Z option tells unzip to treat the rest of the options as zipinfo options. See the man … Read more
You can use rsync with the -n flag to find out if the files are in sync, without actually doing a sync. For example, from server1: rsync -n -avrc /abc/home/sample1/* server2:/abc/home/sample2/ This will print the names of all files (recursive, with the -r flag) that differ between server1:/abc/home/sample1/ and server2:/abc/home/sample2/ rsync used parameters explanation -n, … Read more
I think trap 0 is executed just prior to script termination in all cases, so is useful for cleanup functionality (like removing temporary files, etc). The other signals can have specialized error handling but should terminate the script (that is, call exit). What you have described, I believe, would actually execute cmd twice. Once for … Read more
You can use the “-r” option to set the sender address: mailx -r me@example.com -s …