If this is in fact an Echo SRM 210, then a manual is linked below.
To replace the line on your Ryobi battery-powered weed eater, follow these steps: Turn off the weed eater and disconnect the battery. Remove the spool cover by pressing the tabs on the sides. Take out the spool and remove any remaining line. Cut a new piece of trimmer line to the appropriate length. Insert the line into the spool following the arrows for direction. Reassemble the spool and cover, then reconnect the battery. Test the weed eater to ensure the line is working properly.
To open the weed eater head to replace the trimmer line, first, locate the tabs on the side of the head. Press and hold these tabs while twisting the head counterclockwise to unlock it. Once unlocked, carefully remove the head to access the spool and replace the trimmer line.
echo cat will print out the word 'cat' on the command line. cat echo will attempt to list the contents of a file called 'echo'.
A period right after the "echo" command would echo an empty line.
echo "This is my text" > myfile.txt
Nylon
The echo command is used to print a statement by default to the screen. example: echo Good Morning output: Good Morning note: quotes are not used and will be displayed in the output if used other examples: echo off/on - turns echo on or off, otherwise commands are visible on the screen. Useful for bat files. @echo off - the @ hides the line it precedes so use this for the first line. echo. - displays a blank line echo text > myfile.txt - writes to target location (myfile.txt), overwiting it if it exists. echo text >> myfile.txt - appends to the target (myfile.txt)
Echo
To change the line on a Ryobi weed eater, first, remove the spool cover and take out the old line. Cut a new line to the correct length and insert it into the spool. Wind the line evenly and securely onto the spool, then reassemble the spool cover.
http://lawnandgarden.manualsonline.com/manuals/mfg/weed_eater/545117526.html?idRes=15826863 This link should let you obtain the manual for detailed instructions with photos.
The echo command echoes out any of the command line arguments given to it. It is commonly used in shell scripts to echo what portions of the shell script are doing.